Iterate over the various things that get quarantined.

Author: Half-Shot

docs/admin_api/media_admin_api.md

@@ -47,8 +47,12 @@ to any local media, and any locally-cached copies of remote media.
 The media file itself (and any thumbnails) is not deleted from the server.
 
 Since Synapse 1.128.0, hashes of uploaded media are tracked. If this media
-is quarantined, Synapse will automatically quarantine any uploads with a matching
-hash.
+is quarantined, Synapse will:
+
+ - Quarantine any media with a matching hash that has already been uploaded.
+ - Quarantine any future media.
+ - Quarantine any existing cached remote media.
+ - Quarantine any future remote media.
 
 ## Quarantining media by ID