^^^^ ^^^^^
doesn't make the ".." in typewritten format. And the ascii version
of the file shows '<tt>..</tt>' literally. After looking into linuxdoc dtd,
we found there is no way to make ".." in typewritten font.
Noticed by: Mitsuru IWASAKI <iwasaki@pc.jaring.my>
Added reference to "MAINTAINER on Makefiles" section.