docs: address reviewer feedback

docs/batch-change-1.md

@@ -1,2 +1,2 @@
 # Demo change 1
-Round 1
+Round 3

docs/batch-change-2.md

@@ -1,2 +1,2 @@
 # Demo change 2
-Round 1
+Round 3

docs/batch-change-3.md

@@ -1,2 +1,2 @@
 # Demo change 3
-Round 1
+Round 3

docs/obsolete-demo.md

@@ -1 +0,0 @@
-# Obsolete demo file

docs/rebase-review.md

@@ -0,0 +1,7 @@
+# Rebase review walkthrough
+
+This synthetic change demonstrates a feature branch rebased and merged through a pull request.
+
+- Review the focused documentation diff.
+- Confirm the pull request records the rebase merge method.
+- Keep this fixture separate from production release notes.

docs/review-roundtrip.md

@@ -0,0 +1,3 @@
+# Review roundtrip demo
+
+[DEMO] Revised after requested changes: describe the review workflow here.