added comment

Author: adwk67

template/.github/workflows/build.yml.j2

@@ -348,6 +348,7 @@ jobs:
         if: ${{ github.event_name == 'pull_request' && github.ref == 'refs/heads/main' }}
         run: cargo set-version --offline --workspace 0.0.0-pr${{ github.event.pull_request.number }}
       - name: Update version if PR against non-main branch
+        # For PRs to be merged against a release branch, use the version that has already been set in the calling script.
         if: ${{ github.event_name == 'pull_request' && github.ref != 'refs/heads/main' }}
         run: |
           MANIFEST_VERSION=$(cargo metadata --format-version 1 --no-deps | jq -r '.packages[0].version')
@@ -420,6 +421,7 @@ jobs:
         if: ${{ github.event_name == 'pull_request' && github.ref == 'refs/heads/main' }}
         run: cargo set-version --offline --workspace 0.0.0-pr${{ github.event.pull_request.number }}
       - name: Update version if PR against non-main branch
+        # For PRs to be merged against a release branch, use the version that has already been set in the calling script.
         if: ${{ github.event_name == 'pull_request' && github.ref != 'refs/heads/main' }}
         run: |
           MANIFEST_VERSION=$(cargo metadata --format-version 1 --no-deps | jq -r '.packages[0].version')