docs(RELEASE): clarify release dep examples stay at {VERSION} in step 3

Step 3 was explicit about bumping the README snapshot dependency example to
{NEXT_VERSION}-SNAPSHOT but silent on the README release dependency examples,
which should stay at the just-released {VERSION}. Make that implicit rule
explicit.

Author: claude

docs/RELEASE.md

@@ -23,6 +23,7 @@ the release is published on Maven Central before proceeding.
 Bump **both** files on `main`:
 - `pom.xml` → `{NEXT_VERSION}-SNAPSHOT`
 - `README.md` snapshot dependency example → `{NEXT_VERSION}-SNAPSHOT`
+  (the release dependency examples stay at the just-released `{VERSION}`)
 
 Commit both changes together directly to `main`.