Update documentation about the completion key.

doc/mcedit.1.in

@@ -97,15 +97,18 @@ cuts to
 .BR ~/.mc/cedit/cooledit.clip, 
 and 
 .B Ctrl-Del 
-deletes highlighted text - all linux console only. 
+deletes highlighted text - all linux console only.  Mouse highlighting
-The completion key (see 
+also works, and you can override the mouse as usual by holding down
-.BR "mc.1") 
+the shift key while dragging the mouse to let normal terminal mouse
-also does a hard return
+highlighting work.
-without an automatic indent. Mouse highlighting also works, and you
+.PP
-can override the mouse as usual by holding down the shift key
+The completion key (usually
-while dragging the mouse to let normal terminal mouse highlighting
+.B "Alt-Tab"
-work.
+or
-
+.BR "Espace-Tab")
+completes the word under the cursor using the words used earlier in the
+file.
+.PP
 To define a macro, press 
 .B Ctrl-R 
 and then type out the key