Added an example for multi repos support in README.md.

Updated output string to see which repo failed to update.

Author: taizo

README.md

@@ -23,7 +23,7 @@
 
 #### OWNER_REPOSITORY
 - Required: ***True***
-- Description: The owner and repository name. For example, octocat/Hello-World. If being ran in the repo being updated, you can use `${{github.repository}}`. Multiple repositories can be specified by a comma-separated list.
+- Description: The owner and repository name. For example, octocat/Hello-World. If being ran in the repo being updated, you can use `${{github.repository}}`. Multiple repositories can be specified by a comma-separated list (e.g. `OWNER_REPOSITORY: ${{ github.repository }},MyGitHubOrgOrUser/MyGitHubRepo`). 
 
 #### GITHUB_ACCESS_KEY_NAME
 - Required: ***False***

rotate_keys.py

@@ -132,9 +132,9 @@ def upload_secret(owner_repo,key_name,encrypted_value,pub_key_id,github_token):
     good_status_codes = [204,201]
 
     if updated_secret.status_code not in good_status_codes:
-        print(f'Got status code: {updated_secret.status_code} on updating {key_name}')
+        print(f'Got status code: {updated_secret.status_code} on updating {key_name} in {owner_repo}')
         sys.exit(1)
-    print(f'Uploaded {key_name} to {owner_repo}.')
+    print(f'Updated {key_name} in {owner_repo}')
 
 # run everything
 main_function()