capitalize comments

Author: daniel-sanche

gapic/ads-templates/%namespace/%name/%version/%sub/services/%service/client.py.j2

@@ -119,7 +119,7 @@ class {{ service.client_name }}(metaclass={{ service.client_name }}Meta):
 
         m = mtls_endpoint_re.match(api_endpoint)
         if m is None:
-            # could not parse api_endpoint; return as-is
+            # Could not parse api_endpoint; return as-is.
             return api_endpoint
         name, mtls, sandbox, googledomain = m.groups()
         if mtls or not googledomain:

gapic/templates/%namespace/%name_%version/%sub/services/%service/client.py.j2

@@ -162,7 +162,7 @@ class {{ service.client_name }}(metaclass={{ service.client_name }}Meta):
 
         m = mtls_endpoint_re.match(api_endpoint)
         if m is None:
-            # could not parse api_endpoint; return as-is
+            # Could not parse api_endpoint; return as-is.
             return api_endpoint
 
         name, mtls, sandbox, googledomain = m.groups()