update codeowners for nav (#175)

Author: lnhsingh

.github/CODEOWNERS

@@ -5,6 +5,9 @@
 # the repo. Unless a later match takes precedence, they will be requested for review when someone opens a pull request.
 *       @lnhsingh
 
+# nav file
+/src/docs.json @lnhsingh @katmayb @beklapko
+
 # Any file in the `/src/langgraph-platform`
 # and any of its subdirectories.
 /src/langgraph-platform/ @katmayb @lnhsingh