pidgin/pidgin

Clean up a bunch doc issues.

2020-11-19, Gary Kramlich
55230eededd8
Clean up a bunch doc issues.

Testing Done:
Built the docs a million times verifying the fixes.

Reviewed at https://reviews.imfreedom.org/r/229/
libpurple/data/purple-url-handler.desktop.in
libpurple/protocols/null/nullprpl.c
pidgin/data/im.pidgin.Pidgin.desktop.in
sub/libpurple/data/purple-url-handler.desktop.in
sub/libpurple/protocols/null/nullprpl.c
sub/pidgin/data/im.pidgin.Pidgin.desktop.in