docs: update overall name from iamcredentials to iam

.repo-metadata.json

@@ -1,16 +1,16 @@
 {
-    "name": "iamcredentials",
+    "name": "iam",
     "name_pretty": "Cloud Identity and Access Management",
     "api_description": "Manages identity and access control for Google Cloud Platform resources, including the creation of service accounts, which you can use to authenticate to Google and make API calls.",
     "product_documentation": "https://cloud.google.com/iam/docs/",
-    "client_documentation": "https://cloud.google.com/python/docs/reference/iamcredentials/latest",
+    "client_documentation": "https://cloud.google.com/python/docs/reference/iam/latest",
     "issue_tracker": "https://issuetracker.google.com/savedsearches/559761",
     "release_level": "stable",
     "language": "python",
     "library_type": "GAPIC_AUTO",
     "repo": "googleapis/python-iam",
     "distribution_name": "google-cloud-iam",
-    "api_id": "iamcredentials.googleapis.com",
+    "api_id": "iam.googleapis.com",
     "default_version": "v1",
     "codeowner_team": "",
     "api_shortname": "iamcredentials"

README.rst

@@ -15,7 +15,7 @@ Python Client for Cloud Identity and Access Management API
 .. |versions| image:: https://img.shields.io/pypi/pyversions/google-cloud-iam.svg
    :target: https://pypi.org/project/google-cloud-iam/
 .. _Cloud Identity and Access Management API: https://cloud.google.com/iam/docs/
-.. _Client Library Documentation: https://cloud.google.com/python/docs/reference/iamcredentials/latest
+.. _Client Library Documentation: https://cloud.google.com/python/docs/reference/iam/latest
 .. _Product Documentation:  https://cloud.google.com/iam/docs/
 
 Quick Start