fix(documentai): update the API

#### documentai:v1

The following keys were changed:
- schemas.GoogleCloudDocumentaiV1NextSchema.properties.displayName.description
- schemas.GoogleCloudDocumentaiV1SchemaVersion.properties.displayName.description

Author: yoshi-automation

discovery/documentai-v1.json

@@ -1394,7 +1394,7 @@
       }
     }
   },
-  "revision": "20251202",
+  "revision": "20251209",
   "rootUrl": "https://documentai.googleapis.com/",
   "schemas": {
     "CloudAiDocumentaiLabHifiaToolsValidationValidatorInput": {
@@ -6008,7 +6008,7 @@
           "type": "string"
         },
         "displayName": {
-          "description": "Optional. The user-defined name of the Schema.",
+          "description": "Required. The user-defined name of the Schema.",
           "type": "string"
         },
         "labels": {
@@ -6780,7 +6780,7 @@
           "type": "string"
         },
         "displayName": {
-          "description": "Optional. The user-defined name of the SchemaVersion.",
+          "description": "Required. The user-defined name of the SchemaVersion.",
           "type": "string"
         },
         "labels": {

src/apis/documentai/v1.ts

@@ -4344,7 +4344,7 @@ export namespace documentai_v1 {
      */
     createTime?: string | null;
     /**
-     * Optional. The user-defined name of the Schema.
+     * Required. The user-defined name of the Schema.
      */
     displayName?: string | null;
     /**
@@ -4895,7 +4895,7 @@ export namespace documentai_v1 {
      */
     createTime?: string | null;
     /**
-     * Optional. The user-defined name of the SchemaVersion.
+     * Required. The user-defined name of the SchemaVersion.
      */
     displayName?: string | null;
     /**