Fix markdownlint issues in dependency_management.md.

Signed-off-by: James Blair <mail@jamesblair.net>

Documentation/contributor-guide/dependency_management.md

@@ -1,94 +1,106 @@
-Dependency management
-======
+# Dependency management
+
+## Table of Contents
 
-# Table of Contents
 - **[Main branch](#main-branch)**
-    - [Dependencies used in workflows](#dependencies-used-in-workflows)
-    - [Bumping order](#bumping-order)
-    - [Steps to bump a dependency](#steps-to-bump-a-dependency)
-    - [Indirect dependencies](#indirect-dependencies)
-    - [Known incompatible dependency updates](#known-incompatible-dependency-updates)
-      - [arduino/setup-protoc](#arduinosetup-protoc)
-    - [Rotation worksheet](#rotation-worksheet)
+  - [Dependencies used in workflows](#dependencies-used-in-workflows)
+  - [Bumping order](#bumping-order)
+  - [Steps to bump a dependency](#steps-to-bump-a-dependency)
+  - [Indirect dependencies](#indirect-dependencies)
+  - [Known incompatible dependency updates](#known-incompatible-dependency-updates)
+    - [arduino/setup-protoc](#arduinosetup-protoc)
+  - [Rotation worksheet](#rotation-worksheet)
 - **[Stable branches](#stable-branches)**
 
-# Main branch
+## Main branch
 
 The dependabot is enabled & [configured](https://github.com/etcd-io/etcd/blob/main/.github/dependabot.yml) to
 manage dependencies for etcd `main` branch. But dependabot doesn't work well for multi-module repository like `etcd`,
-see [dependabot-core/issues/6678](https://github.com/dependabot/dependabot-core/issues/6678). 
+see [dependabot-core/issues/6678](https://github.com/dependabot/dependabot-core/issues/6678).
 Usually human intervention is required each time when dependabot automatically opens some PRs to bump dependencies.
 Please see guidance below.
 
-## Dependencies used in workflows
+### Dependencies used in workflows
+
 The PRs which automatically bump dependencies (see examples below) used in workflows are fine, and can be approved & merged directly as long as all checks are successful.
+
 - [build(deps): bump github/codeql-action from 2.2.11 to 2.2.12](https://github.com/etcd-io/etcd/pull/15736)
 - [build(deps): bump actions/checkout from 3.5.0 to 3.5.2](https://github.com/etcd-io/etcd/pull/15735)
 - [build(deps): bump ossf/scorecard-action from 2.1.2 to 2.1.3](https://github.com/etcd-io/etcd/pull/15607)
 
-## Bumping order
+### Bumping order
+
 When multiple etcd modules depend on the same package, please bump the package version for all the modules in the correct order. The rule is simple:
 if module A depends on module B, then bump the dependency for module B before module A. If the two modules do not depend on each other, then
 it doesn't matter to bump which module first. For example, multiple modules depend on `github.com/spf13/cobra`, we need to bump the dependency
 in the following order,
+
 - go.etcd.io/etcd/pkg/v3
 - go.etcd.io/etcd/server/v3
 - go.etcd.io/etcd/etcdctl/v3
 - go.etcd.io/etcd/etcdutl/v3
 - go.etcd.io/etcd/tests/v3
 - go.etcd.io/etcd/v3
 - go.etcd.io/etcd/tools/v3
-For more details about etcd Golang modules, please check https://etcd.io/docs/next/dev-internal/modules/
+For more details about etcd Golang modules, please check <https://etcd.io/docs/next/dev-internal/modules>
 
 Note the module `go.etcd.io/etcd/tools/v3` doesn't depend on any other modules, nor by any other modules, so it doesn't matter when to bump dependencies for it.
 
-## Steps to bump a dependency
+### Steps to bump a dependency
+
 Use the `github.com/spf13/cobra` as an example, follow steps below to bump it from 1.6.1 to 1.7.0 for module `go.etcd.io/etcd/etcdctl/v3`,
-```
-$ cd ${ETCD_ROOT_DIR}/etcdctl
-$ go get github.com/spf13/cobra@v1.7.0
-$ go mod tidy
-$ cd ..
-$ ./scripts/fix.sh
+
+```bash
+cd ${ETCD_ROOT_DIR}/etcdctl
+go get github.com/spf13/cobra@v1.7.0
+go mod tidy
+cd ..
+./scripts/fix.sh
 ```
 
 Execute the same steps for all other modules. When you finish bumping the dependency for all modules, then commit the change,
-```
-$ git add .
-$ git commit --signoff -m "dependency: bump github.com/spf13/cobra from 1.6.1 to 1.7.0"
+
+```bash
+git add .
+git commit --signoff -m "dependency: bump github.com/spf13/cobra from 1.6.1 to 1.7.0"
 ```
 
 Please close the related PRs which were automatically opened by dependabot. 
 
 When you bump multiple dependencies in one PR, it's recommended to create a separate commit for each dependency. But it isn't a must; for example,
 you can get all dependencies bumping for the module `go.etcd.io/etcd/tools/v3` included in one commit.
 
-## Indirect dependencies
+### Indirect dependencies
+
 Usually we don't bump a dependency if all modules just indirectly depend on it, such as `github.com/go-logr/logr`.
 
 If an indirect dependency (e.g. `D1`) causes any CVE or bugs which affect etcd, usually the module (e.g. `M1`, not part of etcd, but used by etcd)
 which depends on it should bump the dependency (`D1`), and then etcd just needs to bump `M1`. However, if the module (`M1`) somehow doesn't
-bump the problematic dependency, then etcd can still bump it (`D1`) directly following the same steps above. But as a long-term solution, etcd should 
+bump the problematic dependency, then etcd can still bump it (`D1`) directly following the same steps above. But as a long-term solution, etcd should
 try to remove the dependency on such module (`M1`) that lack maintenance.
 
 For mixed cases, in which some modules directly while others indirectly depend on a dependency, we have multiple options,
+
 - Bump the dependency for all modules, no matter it's direct or indirect dependency.
 - Bump the dependency only for modules which directly depend on it.
 
 We should try to follow the first way, and temporarily fall back to the second one if we run into any issue on the first way. Eventually we
 should fix the issue and ensure all modules depend on the same version of the dependency.
 
-## Known incompatible dependency updates
+### Known incompatible dependency updates
+
+#### arduino/setup-protoc
 
-### arduino/setup-protoc
 Please refer to [build(deps): bump arduino/setup-protoc from 1.3.0 to 2.0.0](https://github.com/etcd-io/etcd/pull/16016)
 
-## Rotation worksheet
+### Rotation worksheet
+
 The dependabot scheduling interval is weekly; it means dependabot will automatically raise a bunch of PRs per week.
 Usually human intervention is required each time. We have a [rotation worksheet](https://docs.google.com/spreadsheets/d/1DDWzbcOx1p32MhyelaPZ_SfYtAD6xRsrtGRZ9QXPOyQ/edit#gid=0),
 and everyone is welcome to participate; you just need to register your name in the worksheet.
 
-# Stable branches
+## Stable branches
+
 Usually we don't proactively bump dependencies for stable releases unless there are any CVEs or bugs that affect etcd.
 
 If we have to do it, then follow the same guidance above. Note that there is no `./scripts/fix.sh` in release-3.4, so no need to