Enhance changelog PR message with URL and notes

Updated the changelog PR body to include a link to the CHANGELOG file and added notes for reviewers.

Author: hubwriter

.github/workflows/create-changelog-pr.yml

@@ -15,6 +15,7 @@ permissions:
 
 env:
   CHANGELOG_FILE: CHANGELOG.md
+  CHANGELOG_FILE_URL: https://github.com/github/docs-internal/blob/main/CHANGELOG.md
 
 jobs:
   docs-changelog-pr:
@@ -113,7 +114,7 @@ jobs:
               owner: context.repo.owner,
               repo: context.repo.repo,
               title: `Update docs changelog (for PR #${context.payload.issue.number})`,
-              body: `### Automated docs changelog update\n\n**Purpose:** Update the <code>${{ env.CHANGELOG_FILE }}</code> file with details of a recent docs change.\n\nThis PR is an automated update, generated by the <code>create-changelog-pr.yml</code> Actions workflow as a result of a "Changelog summary" comment being added to [PR #${context.payload.issue.number}](${context.payload.issue.html_url}).\n\n**Note for reviewer**: This change to the <code>${{ env.CHANGELOG_FILE }}</code> file will be synced to the public docs site, so make sure that the content of the entry is appropriate for public consumption. If the content is wholly inappropriate for public consumption, then this PR can be closed.\n\n<details><summary>Original PR comment posted by @${context.payload.comment.user.login}, using the <code>/changelog</code> slash command:</summary>\n\n${context.payload.comment.body}</details>`,
+              body: `### Automated docs changelog update\n\n**Purpose:** Update the <code>[${{ env.CHANGELOG_FILE }}](${{ env.CHANGELOG_FILE_URL }})</code> file with details of a recent docs change.\n\nThis PR is an automated update, generated by the <code>create-changelog-pr.yml</code> Actions workflow as a result of a "Changelog summary" comment being added to [PR #${context.payload.issue.number}](${context.payload.issue.html_url}).\n\n**Notes for reviewer**:\n- This change to the <code>[${{ env.CHANGELOG_FILE }}](${{ env.CHANGELOG_FILE_URL }})</code> file will be synced to the public docs site, so make sure that the content of the entry is appropriate for public consumption. If the content is wholly inappropriate for public consumption, then this PR can be closed.\n- Make sure the format of this changelog entry is consistent with the other entries in the file.\n\n<details><summary>Original PR comment posted by @${context.payload.comment.user.login}, using the <code>/changelog</code> slash command:</summary>\n\n${context.payload.comment.body}</details>`,
               head: process.env.BRANCH,
               base: 'main'
             });