Rename test flag

Author: aliu39

docs/platforms/python/integrations/featureflags/index.mdx

@@ -40,11 +40,11 @@ The integration is tested by calling the `add_feature_flag` API before capturing
 import sentry_sdk
 from sentry_sdk.integrations.featureflags import add_feature_flag
 
-add_feature_flag('hello', False)
+add_feature_flag('test-flag', False)
 
 sentry_sdk.capture_exception(Exception("Something went wrong!"))
 ```
 
-Visit the Sentry website and confirm that your error event has recorded the feature flag "hello" and its value "false".
+Visit the Sentry website and confirm that your error event has recorded the feature flag "test-flag" and its value "false".
 
 <PlatformContent includePath="feature-flags/next-steps" />