fix style issues

Author: cwanjau

src/azure-cli/azure/cli/command_modules/appconfig/_constants.py

@@ -55,7 +55,7 @@ class FeatureFlagConstants:
     # Telemetry properties
     METADATA = "metadata"
 
-    #feature flags key
+    # feature flags key
     FEATURE_FLAGS_KEY = "feature_flags"