org-manual: Fix documentation about org-agenda-bulk-toggle-all

Reported by Ian Garmaise.
Archived-At: <http://permalink.gmane.org/gmane.emacs.orgmode/123486>

doc/org-manual.org

@@ -9894,7 +9894,7 @@ the other commands, point needs to be in the desired line.
      #+kindex: M-*
      #+findex: org-agenda-bulk-toggle-all
 
-     Mark entries matching a regular expression for bulk action.
+     Toggle mark of every entry for bulk action.
 
 - {{{kbd(%)}}} (~org-agenda-bulk-mark-regexp~) ::
      #+kindex: %