Add unbound "toggle" action for customization

man/man1/fzf.1

@@ -181,12 +181,13 @@ e.g. \fBfzf --bind=ctrl-j:accept,ctrl-k:kill-line\fR
     end-of-line
     forward-char
     forward-word
-    kill-line
+    kill-line (not bound)
     kill-word
     page-down
     page-up
+    toggle (not bound)
     toggle-down
-    toggle-sort
+    toggle-sort (not bound; equivalent to \fB--toggle-sort\fR)
     toggle-up
     unix-line-discard
     unix-word-rubout