Fix some formatting in protobuf spec.
Fix some formatting in protobuf spec.

Change-Id: I8aba128dad1109d6740710498e69b732929164d1
Reviewed-on: http://review.couchbase.org/42848
Tested-by: Aliaksey Artamonau <3c875bcfb3adf2a65b2ae7686ca921e6c9433147@gmail.com>
Reviewed-by: Aliaksey Kandratsenka <340b8e09ca65cd3fc686427fcfed17e87eaf61e2@gmail.com>

couchbase/gometa,t3rm1n4l/gometa