docs: Clarify that [initial_user](http://_vscodecontentref_/3) is not required in Cluster

Google APIs · copybara-github · commit 35365cb31245 · 2025-12-08T11:58:06.000-08:00
The comment for the [initial_user](http://_vscodecontentref_/4) field in the [Cluster](http://_vscodecontentref_/5) message has been updated to remove the "Required." annotation, better reflecting its optional nature.

PiperOrigin-RevId: 841859434
diff --git a/google/cloud/alloydb/v1/resources.proto b/google/cloud/alloydb/v1/resources.proto
@@ -693,7 +693,7 @@ message Cluster {
   // system actions like failover or maintenance.
   bool reconciling = 13 [(google.api.field_behavior) = OUTPUT_ONLY];
 
-  // Input only. Initial user to setup during cluster creation. Required.
+  // Input only. Initial user to setup during cluster creation.
   // If used in `RestoreCluster` this is ignored.
   UserPassword initial_user = 14 [(google.api.field_behavior) = INPUT_ONLY];
 
