Add release notes for tf-serving 2.13.0-rc2

PiperOrigin-RevId: 549697590

Author: rtg0795

RELEASE.md

@@ -1,3 +1,17 @@
+# Release 2.13.0-rc2
+
+## Major Features and Improvements
+
+* No major features or improvements.
+
+## Breaking Changes
+
+* No breaking changes.
+
+## Bug Fixes and Other Changes
+
+* This release is based on TF version 2.13.0-rc2
+
 # Release 2.13.0-rc1
 
 ## Major Features and Improvements