fix(secretmanager): clean up some issues with create_secret (#13429)

* fix(secretmanager): clean up some issues with create_secret

* arguments make this required in running, but the function says optional
* remove duplicate import

* fix: resolve error with importing in the wrong place

* apply black on file

---------

Co-authored-by: Katie McLaughlin <katie@glasnt.com>

Author: iennae

secretmanager/snippets/create_secret.py

@@ -19,10 +19,11 @@
 import argparse
 from typing import Optional
 
+# [START secretmanager_create_secret]
+# Import the Secret Manager client library.
 from google.cloud import secretmanager
 
 
-# [START secretmanager_create_secret]
 def create_secret(
     project_id: str, secret_id: str, ttl: Optional[str] = None
 ) -> secretmanager.Secret:
@@ -50,9 +51,6 @@ def create_secret(
         new_secret_with_ttl = create_secret("my-project", "my-timed-secret", "7776000s")
     """
 
-    # Import the Secret Manager client library.
-    from google.cloud import secretmanager
-
     # Create the Secret Manager client.
     client = secretmanager.SecretManagerServiceClient()
 
@@ -81,7 +79,7 @@ def create_secret(
     )
     parser.add_argument("project_id", help="id of the GCP project")
     parser.add_argument("secret_id", help="id of the secret to create")
-    parser.add_argument("ttl", help="time to live for secrets, f.e. '600s' ")
+    parser.add_argument("--ttl", help="time to live for secrets, f.e. '600s' ")
     args = parser.parse_args()
 
     create_secret(args.project_id, args.secret_id, args.ttl)