[mutter] event-x11: Use CLUTTER prefix for X11 filter docs

[Carlos Garnacho <carlosg src gnome org>]

commit 9234fcb6248c41d09e46d4e5b7747f78052b2b83
Author: Marco Trevisan (Treviño) <mail 3v1n0 net>
Date:   Sat Aug 31 17:48:43 2019 +0200

    event-x11: Use CLUTTER prefix for X11 filter docs
    
    As per commit ad72fa46b clutter_x11_handle_event was renamed into
    meta_x11_handle_event but the return type didn't change.
    
    So, keep the doc-string to match the actual possible return values.
    
    https://gitlab.gnome.org/GNOME/mutter/merge_requests/764

 src/backends/x11/meta-event-x11.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/backends/x11/meta-event-x11.c b/src/backends/x11/meta-event-x11.c
index 8b4f4fc81..19da2235b 100644
--- a/src/backends/x11/meta-event-x11.c
+++ b/src/backends/x11/meta-event-x11.c
@@ -82,12 +82,12 @@ meta_x11_handle_event (XEvent *xevent)
   gboolean allocated_event;
 
   /* The return values here are someone approximate; we return
-   * META_X11_FILTER_REMOVE if a clutter event is
+   * CLUTTER_X11_FILTER_REMOVE if a clutter event is
    * generated for the event. This mostly, but not entirely,
    * corresponds to whether other event processing should be
    * excluded. As long as the stage window is not shared with another
    * toolkit it should be safe, and never return
-   * %META_X11_FILTER_REMOVE when more processing is needed.
+   * %CLUTTER_X11_FILTER_REMOVE when more processing is needed.
    */
 
   result = CLUTTER_X11_FILTER_CONTINUE;