vim-patch:8.0.0609: some people still don't know how to quit (#8571)

Problem:    For some people the hint about quitting is not sufficient.
Solution:   Put <Enter> separately.  Also use ":qa!" to get out even when
            there are changes.
28a8193e31

src/nvim/normal.c

@@ -7464,8 +7464,10 @@ static void nv_esc(cmdarg_T *cap)
     if (restart_edit == 0
         && cmdwin_type == 0
         && !VIsual_active
-        && no_reason)
-      MSG(_("Type  :quit<Enter>  to exit Nvim"));
+        && no_reason) {
+      MSG(_("Type  :qa!  and press <Enter> to abandon all changes"
+            " and exit Nvim"));
+    }
 
     /* Don't reset "restart_edit" when 'insertmode' is set, it won't be
      * set again below when halfway through a mapping. */