RepoDetails.md: Fix markdownlint errors

Uses consistent unordered list markers in the file to meet
markdownlint's expectations.

Signed-off-by: Michael Kubacki <michael.kubacki@microsoft.com>

RepoDetails.md

@@ -10,16 +10,16 @@ This repository is considered foundational and fundamental to Project Mu. The
 guiding philosophy is that this any code within this repository should be one or
 more of the following
 
-* Part of the build system
-* Common to any silicon architecture
-* Part of the "API layer" that contains protocol and library definitions
+- Part of the build system
+- Common to any silicon architecture
+- Part of the "API layer" that contains protocol and library definitions
   including
-  * Industry Standards
-  * UEFI Specifications
-  * ACPI Specifications
-* Part of the "PI" layer that contains driver dispatch logic, event/signaling
+  - Industry Standards
+  - UEFI Specifications
+  - ACPI Specifications
+- Part of the "PI" layer that contains driver dispatch logic, event/signaling
   logic, or memory management logic
-  * This can also include central technologies like variable services
+  - This can also include central technologies like variable services
 
 The repo also includes some changes for building Rust code. See the following documents for more information:
 
@@ -81,8 +81,8 @@ Details](https://microsoft.github.io/mu/How/contributing/)
 Please follow the general Project Mu Pull Request process.  [More
 Details](https://microsoft.github.io/mu/How/contributing/)
 
-* [Code Requirements](https://microsoft.github.io/mu/CodeDevelopment/requirements/)
-* [Doc Requirements](https://microsoft.github.io/mu/DeveloperDocs/requirements/)
+- [Code Requirements](https://microsoft.github.io/mu/CodeDevelopment/requirements/)
+- [Doc Requirements](https://microsoft.github.io/mu/DeveloperDocs/requirements/)
 
 ## Builds