Restore flags list and add versioning comment

Author: aliu39

develop-docs/application/feedback-architecture.mdx

@@ -209,6 +209,14 @@ This feature is available if you enable the following feature flags.
 - `organizations:user-feedback-ui`
 - `organizations:user-feedback-replay-clip` (v24.7.1+)
 
+Auto-registered flags for issue platform, for versions \<= v24.10.0 only:
+
+- `organizations:feedback-ingest`
+- `organizations:feedback-visible`
+- `organizations:feedback-post-process-group`
+
+(You won't be able to grep for these in the sentry repo, but you do need to enable them.)
+
 You need to have v24.4.2 or higher in order to use the latest functionality of User
 Feedback, such as adding screenshots. Also note that User Feedback is only available
 in feature-complete Sentry, _not_ errors-only.