docs: fix example comments

[yoshi-automation]

This PR was generated using Autosynth. 🌈

Here's the log from Synthtool:

synthtool > Executing /tmpfs/src/git/autosynth/working_repo/synth.py.
synthtool > Ensuring dependencies.
synthtool > Pulling artman image.
latest: Pulling from googleapis/artman
Digest: sha256:80c39fa84e7203c8f355e01bdeef82155013cc39dcaa48fba7a6fe2c253623e3
Status: Image is up to date for googleapis/artman:latest
synthtool > Cloning googleapis.
synthtool > Running generator for google/spanner/artman_spanner.yaml.
synthtool > Generated code into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/js/spanner-v1.
synthtool > Running generator for google/spanner/admin/database/artman_spanner_admin_database.yaml.
synthtool > Generated code into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/js/spanner-admin-database-v1.
synthtool > Running generator for google/spanner/admin/instance/artman_spanner_admin_instance.yaml.
synthtool > Generated code into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/js/spanner-admin-instance-v1.
.eslintignore
.eslintrc.yml
.github/CONTRIBUTING.md
.github/ISSUE_TEMPLATE/bug_report.md
.github/ISSUE_TEMPLATE/feature_request.md
.github/ISSUE_TEMPLATE/support_request.md
.jsdoc.js
.kokoro/common.cfg
.kokoro/continuous/node10/common.cfg
.kokoro/continuous/node10/test.cfg
.kokoro/continuous/node11/common.cfg
.kokoro/continuous/node11/test.cfg
.kokoro/continuous/node6/common.cfg
.kokoro/continuous/node6/test.cfg
.kokoro/continuous/node8/common.cfg
.kokoro/continuous/node8/docs.cfg
.kokoro/continuous/node8/lint.cfg
.kokoro/continuous/node8/samples-test.cfg
.kokoro/continuous/node8/system-test.cfg
.kokoro/continuous/node8/test.cfg
.kokoro/docs.sh
.kokoro/lint.sh
.kokoro/presubmit/node10/common.cfg
.kokoro/presubmit/node10/test.cfg
.kokoro/presubmit/node11/common.cfg
.kokoro/presubmit/node11/test.cfg
.kokoro/presubmit/node6/common.cfg
.kokoro/presubmit/node6/test.cfg
.kokoro/presubmit/node8/common.cfg
.kokoro/presubmit/node8/docs.cfg
.kokoro/presubmit/node8/lint.cfg
.kokoro/presubmit/node8/samples-test.cfg
.kokoro/presubmit/node8/system-test.cfg
.kokoro/presubmit/node8/test.cfg
.kokoro/presubmit/windows/common.cfg
.kokoro/presubmit/windows/test.cfg
.kokoro/publish.sh
.kokoro/release/publish.cfg
.kokoro/samples-test.sh
.kokoro/system-test.sh
.kokoro/test.bat
.kokoro/test.sh
.kokoro/trampoline.sh
.nycrc
.prettierignore
.prettierrc
CODE_OF_CONDUCT.md
LICENSE
codecov.yaml
renovate.json
synthtool > Replaced "(const SpannerClient = require\\('\\./spanner_client'\\);)" in src/v1/index.js.
synthtool > Replaced '(module\\.exports\\.SpannerClient = SpannerClient;)' in src/v1/index.js.
synthtool > Replaced '../../package.json' in src/v1/database_admin_client.js.
synthtool > Replaced '../../package.json' in src/v1/instance_admin_client.js.
synthtool > Replaced '../../package.json' in src/v1/spanner_client.js.
synthtool > Replaced 'https:\\/\\/cloud\\.google\\.com[\\s\\*]*http:\\/\\/(.*)[\\s\\*]*\\)' in src/v1/doc/google/protobuf/doc_timestamp.js.
synthtool > Replaced 'toISOString\\]' in src/v1/doc/google/protobuf/doc_timestamp.js.
synthtool > Replaced '`\\[a-z\\]\\(https:\\/\\/cloud\\.google\\.com\\[-a-z0-9\\]\\*\\[a-z0-9\\]\\)\\?`' in src/v1/doc/google/spanner/admin/instance/v1/doc_spanner_instance_admin.js.
synthtool > Replaced '`\\[a-z\\]\\(https:\\/\\/cloud\\.google\\.com\\[-a-z0-9\\]\\*\\[a-z0-9\\]\\)\\?`' in src/v1/doc/google/spanner/v1/doc_spanner.js.
synthtool > Replaced '`\\(\\[a-z\\]\\(https:\\/\\/cloud\\.google\\.com\\[-a-z0-9\\]\\*\\[a-z0-9\\]\\)\\?\\)\\?`' in src/v1/doc/google/spanner/admin/instance/v1/doc_spanner_instance_admin.js.
synthtool > Replaced '`\\(\\[a-z\\]\\(https:\\/\\/cloud\\.google\\.com\\[-a-z0-9\\]\\*\\[a-z0-9\\]\\)\\?\\)\\?`' in src/v1/doc/google/spanner/v1/doc_spanner.js.
npm WARN deprecated text-encoding@0.6.4: no longer maintained
npm WARN deprecated circular-json@0.3.3: CircularJSON is in maintenance only, flatted is its successor.

> grpc@1.18.0 install /tmpfs/src/git/autosynth/working_repo/node_modules/grpc
> node-pre-gyp install --fallback-to-build --library=static_library

node-pre-gyp WARN Using request for node-pre-gyp https download 
[grpc] Success: "/tmpfs/src/git/autosynth/working_repo/node_modules/grpc/src/node/extension_binary/node-v57-linux-x64-glibc/grpc_node.node" is installed via remote

> protobufjs@6.8.8 postinstall /tmpfs/src/git/autosynth/working_repo/node_modules/protobufjs
> node scripts/postinstall


> @google-cloud/spanner@2.2.1 prepare /tmpfs/src/git/autosynth/working_repo
> npm run compile


> @google-cloud/spanner@2.2.1 compile /tmpfs/src/git/autosynth/working_repo
> tsc -p . && cp -r src/v1 build/src && cp -r protos build && cp test/*.js build/test

npm notice created a lockfile as package-lock.json. You should commit this file.
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@1.2.7 (node_modules/fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@1.2.7: wanted {"os":"darwin","arch":"any"} (current: {"os":"linux","arch":"x64"})

added 1380 packages from 1357 contributors and audited 5485 packages in 35.671s
found 1 low severity vulnerability
  run `npm audit fix` to fix them, or `npm audit` for details

> @google-cloud/spanner@2.2.1 fix /tmpfs/src/git/autosynth/working_repo
> gts fix && eslint --fix '**/*.js'

synthtool > Cleaned up 2 temporary directories.
synthtool > Wrote metadata to synth.metadata.