Provide a man page for parse-headers.pl, describing
how to use it.

The documentation on ReST format was generated via pod2rst:
http://search.cpan.org/~dowens/Pod-POM-View-Restructured-0.02/bin/pod2rst

Signed-off-by: Mauro Carvalho Chehab
Signed-off-by: Jonathan Corbet