chore: Fix contents_delta_uri docstring for matching engine create operations

PiperOrigin-RevId: 696981054

Author: vertex-sdk-bot

google/cloud/aiplatform/matching_engine/matching_engine_index.py

@@ -122,10 +122,8 @@ def _create(
                 The name can be up to 128 characters long and
                 can be consist of any UTF-8 characters.
             contents_delta_uri (str):
-                Optional. Allows inserting, updating  or deleting the contents of the Matching Engine Index.
-                The string must be a valid Google Cloud Storage directory path. If this
-                field is set when calling IndexService.UpdateIndex, then no other
-                Index field can be  also updated as part of the same call.
+                Optional. Allows inserting the initial contents of the Matching Engine Index.
+                The string must be a valid Google Cloud Storage directory path.
                 The expected structure and format of the files this URI points to is
                 described at
                 https://cloud.google.com/vertex-ai/docs/vector-search/setup/format-structure
@@ -458,10 +456,8 @@ def create_tree_ah_index(
                 The name can be up to 128 characters long and
                 can be consist of any UTF-8 characters.
             contents_delta_uri (str):
-                Optional. Allows inserting, updating  or deleting the contents of the Matching Engine Index.
-                The string must be a valid Google Cloud Storage directory path. If this
-                field is set when calling IndexService.UpdateIndex, then no other
-                Index field can be  also updated as part of the same call.
+                Optional. Allows inserting the initial contents of the Matching Engine Index.
+                The string must be a valid Google Cloud Storage directory path.
                 The expected structure and format of the files this URI points to is
                 described at
                 https://cloud.google.com/vertex-ai/docs/vector-search/setup/format-structure
@@ -619,10 +615,8 @@ def create_brute_force_index(
                 The name can be up to 128 characters long and
                 can be consist of any UTF-8 characters.
             contents_delta_uri (str):
-                Optional. Allows inserting, updating  or deleting the contents of the Matching Engine Index.
-                The string must be a valid Google Cloud Storage directory path. If this
-                field is set when calling IndexService.UpdateIndex, then no other
-                Index field can be  also updated as part of the same call.
+                Optional. Allows inserting the initial contents of the Matching Engine Index.
+                The string must be a valid Google Cloud Storage directory path.
                 The expected structure and format of the files this URI points to is
                 described at
                 https://cloud.google.com/vertex-ai/docs/vector-search/setup/format-structure