docs: add backticks around 'secrets' in docstring

Co-Authored-By: Aaron <AJ> Steers <[email protected]>

Author: devin-ai-integration[bot]

airbyte_cdk/cli/airbyte_cdk/_secrets.py

@@ -9,7 +9,7 @@
     airbyte-cdk secrets fetch  # Run from within a connector directory
 
 The 'fetch' command retrieves secrets from Google Secret Manager based on connector
-labels and writes them to the connector's secrets directory.
+labels and writes them to the connector's `secrets` directory.
 """
 
 import json