api/server: commenting proppy from maintainer

Signed-off-by: Johan Euphrosine <proppy@google.com>

api/server/MAINTAINERS

@@ -1,2 +1,2 @@
 Victor Vieux <vieux@docker.com> (@vieux)
-Johan Euphrosine <proppy@google.com> (@proppy)
+# Johan Euphrosine <proppy@google.com> (@proppy)