Update RELEASE.md with commit message format sample.

Bug: None
Test: View in Markdown editor.
Change-Id: I21822dc5606462ef7a125186ac582b81fd9aac7e
diff --git a/RELEASE.md b/RELEASE.md
index 30e4d58..d95d8f2 100644
--- a/RELEASE.md
+++ b/RELEASE.md
@@ -9,6 +9,15 @@
 * Tag the commit with the next version number:
 `minijail$ git tag -a linux-v<N+1> <commit>`
 
+* Commit message:
+```
+Minijail v<N+1>.
+
+New in this release:
+*New feature (author@domain).
+*New feature 2 (author2@domain2).
+```
+
 * Push the tag:
 `minijail$ git push aosp linux-v<N+1>`