Fix formatting in release note

Change-Id: I010b40b000f4b2736d03515a90c6bb5d09c6b621
(cherry picked from commit 9ebe50a)

Author: priteau

releasenotes/notes/move-api-docs-to-api-ref-be71b864e557110e.yaml

@@ -1,5 +1,5 @@
 ---
 other:
   - |
-    API reference/docs have been moved to `api-ref/source/` and the original
+    API reference/docs have been moved to ``api-ref/source/`` and the original
     path now contains a symlink to this directory.