Merge pull request #5854 from nextcloud/docs/919

Add documentation about occ files:scan-app-data

admin_manual/configuration_server/occ_command.rst

@@ -641,6 +641,7 @@ File operations
  files
   files:cleanup              cleanup filecache
   files:scan                 rescan filesystem
+  files:scan-app-data        rescan the AppData folder
   files:transfer-ownership   All files' and folders' ownerships are moved to another 
                              user. Outgoing shares are moved as well.
                              Incoming shares are not moved because the sharing user 
@@ -698,6 +699,24 @@ path component given.
 The ``--path``, ``--all`` and ``[user_id]`` parameters are exclusive - only 
 one must be specified.
 
+Scan appdata
+^^^^^^^^^^^^^
+
+Appdata is a folder inside of the data directory which contains files that
+are shared between users and can be put there by the server or apps like
+avatar images, file previews and cached CSS files for example.
+
+Since the regular files scan only operates on user files the ``occ files:scan-app-data``
+command will check the appdata directory and make sure that the filecache is consistent
+with the files on the actual storage.::
+
+  Usage:
+    files:scan-app-data [options] [--] [<folder>]
+
+  Arguments:
+    folder                 The appdata subfolder to scan [default: ""]
+
+
 Cleanup
 ^^^^^^^