docs: tightened requirements on cloud storage subscription filename suffixes

Google APIs · copybara-github · commit 212ecef96e3e · 2023-06-26T12:01:01.000-07:00
PiperOrigin-RevId: 543503563
diff --git a/google/pubsub/v1/pubsub.proto b/google/pubsub/v1/pubsub.proto
@@ -1061,7 +1061,8 @@ message CloudStorageConfig {
   string filename_prefix = 2;
 
   // User-provided suffix for Cloud Storage filename. See the [object naming
-  // requirements](https://cloud.google.com/storage/docs/objects#naming).
+  // requirements](https://cloud.google.com/storage/docs/objects#naming). Must
+  // not end in "/".
   string filename_suffix = 3;
 
   // Defaults to text format.
