Fix docstring

Author: tw4l

backend/btrixcloud/models.py

@@ -2660,7 +2660,7 @@ class OptimizePagesJob(BackgroundJob):
 
 # ============================================================================
 class CopyBucketJob(BackgroundJob):
-    """Model for tracking job to copy entire s3 bucket"""
+    """Model for tracking job to copy entire 'directory' between s3 buckets"""
 
     type: Literal[BgJobType.COPY_BUCKET] = BgJobType.COPY_BUCKET
     prev_storage: StorageRef