Generate most non-appengine readmes

Change-Id: I3779282126cdd05b047194d356932b9995484115

Author: Jon Wayne Parrott

samples/snippets/README.rst

@@ -128,7 +128,8 @@ To run this sample:
     For more information, see the README.md under /bigquery.
     
     Example invocation:
-        $ python async_query.py           'SELECT corpus FROM `publicdata.samples.shakespeare` GROUP BY corpus'
+        $ python async_query.py \
+              'SELECT corpus FROM `publicdata.samples.shakespeare` GROUP BY corpus'
     
     positional arguments:
       query       BigQuery SQL Query.