Problem: OS/2 and MS-DOS are still mentioned, even though support was
removed long ago.
Solution: Update documentation. (Yegappan Lakshmanan, closes#5368)
Problem: Non-GUI specific settings in the gvimrc_example file.
Solution: Move some settings to the vimrc_example file. Remove setting
'hlsearch' again. (suggested by Hirohito Higashi)
