docs: tightened requirements on cloud storage subscription filename s…

…uffixes

PiperOrigin-RevId: 543503563

Source-Link: googleapis/googleapis@212ecef

Source-Link: googleapis/googleapis-gen@532d27e
Copy-Tag: eyJwIjoiYXBpcy9Hb29nbGUuQ2xvdWQuUHViU3ViLlYxLy5Pd2xCb3QueWFtbCIsImgiOiI1MzJkMjdlZWE2ZmYxMjhmZGNiYjMzMzIxNzZlODk0ZTc2ZGNjNjg1In0=

apis/Google.Cloud.PubSub.V1/Google.Cloud.PubSub.V1/Pubsub.g.cs

@@ -8025,7 +8025,8 @@ public sealed partial class CloudStorageConfig : pb::IMessage<CloudStorageConfig
     private string filenameSuffix_ = "";
     /// <summary>
     /// 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 "/".
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     [global::System.CodeDom.Compiler.GeneratedCode("protoc", null)]