master 70514c6: Clean up obsolete comment

[Lars Ingebrigtsen]

branch: master
commit 70514c6374f8432c34d345216b4df6cf37151d9a
Author: Matt Armstrong <matt@rfc20.org>
Commit: Lars Ingebrigtsen <larsi@gnus.org>

    Clean up obsolete comment
    
    * src/marker.c (unchain_marker): Clean up obsolete comment
    (bug#46836).
    
    Commit cf3164523b (* src/alloc.c: Avoid O(N²) complexity when
    unchaining markers (bug#24548)., 2018-03-23) removed the call from GC
    into unchain_marker, so there is no need to warn about it.
---
 src/marker.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/src/marker.c b/src/marker.c
index 5979151..2b137b1 100644
--- a/src/marker.c
+++ b/src/marker.c
@@ -634,16 +634,15 @@ set_marker_restricted_both (Lisp_Object marker, 
Lisp_Object buffer,
 /* Detach a marker so that it no longer points anywhere and no longer
    slows down editing.  Do not free the marker, though, as a change
    function could have inserted it into an undo list (Bug#30931).  */
+
 void
 detach_marker (Lisp_Object marker)
 {
   Fset_marker (marker, Qnil, Qnil);
 }
 
-/* Remove MARKER from the chain of whatever buffer it is in,
-   leaving it points to nowhere.  This is called during garbage
-   collection, so we must be careful to ignore and preserve
-   mark bits, including those in chain fields of markers.  */
+/* Remove MARKER from the chain of whatever buffer it is in.  Set its
+   buffer NULL.  */
 
 void
 unchain_marker (register struct Lisp_Marker *marker)