chore(java-iam-policy): update name pretty

Author: zhumin8

generation_config.yaml

@@ -1442,7 +1442,7 @@ libraries:
   GAPICs:
   - proto_path: google/iam/admin/v1
 - api_shortname: iam-policy
-  name_pretty: IAM
+  name_pretty: Google Cloud IAM Policy
   product_documentation: n/a
   api_description: n/a
   release_level: stable

librarian.yaml

@@ -2146,7 +2146,7 @@ libraries:
         - google-iam-policy
         - proto-google-iam-v1
       released_version: 1.90.0
-      name_pretty_override: IAM
+      name_pretty_override: Google Cloud IAM Policy
       product_documentation_override: n/a
   - name: iamcredentials
     version: 2.93.0