Misc updates to CONTRIBUTING.md (#1714)

CONTRIBUTING.md

@@ -60,7 +60,7 @@ repo.
 6.  **Pull in `main`** to get the last PR.
 7.  **Ensure** that you're:
     - On the default branch, `main`
-    - At the commit that you want to tag as the next release (usually `@HEAD`).
+    - At the commit that you want to tag as v0.X.Y
 8.  **Create tags** for v0.X.Y (we currently need two):
 
     ```sh
@@ -69,8 +69,8 @@ repo.
     git tag dependencies/$REL
     ```
 
-9.  **Push the new tags** to the main repo (which is named `upstream` in the
-    following setup):
+9.  **Push the new tags** to the main repo, which is named `upstream` in the
+    following example:
 
     ```console
     $ git push upstream $REL && git push upstream dependencies/$REL
@@ -84,19 +84,17 @@ repo.
     - From the **release/tag dropdown**: Select the new release tag that you
       just pushed, v0.X.Y.
     - Set the **release title** to the release number (without the "v").
-    - Click "auto-generate release notes" to get the release details.
-    - Replace the auto-generated "## What's Changed" heading by the following:
+    - Click **Generate release notes** to get the release details inserted into
+      the release notes text area.
+    - Add the following text atop the generated release notes, but replace the
+      `0XY` anchor target with a target appropriate for this release:
 
       ```markdown
       ## Release summary
 
       See, https://github.com/google/docsy/blob/main/CHANGELOG.md#0XY
-
-      ## Commit details
       ```
 
-    - Replace the `0XY` anchor target above with a target appropriate for this
-      release.
     - Remove the "New contributors" autogenerated text (if present) since we
       don't publish that as part of our release notes.
     - Select **Create a discussion for this release**.