smartctl.8.in, smartd.8.in, smartd.conf.5.in: Avoid '.SH' macros with no argument.
Remove colons from section names.

git-svn-id: https://svn.code.sf.net/p/smartmontools/code/trunk/smartmontools@3940 4ea69e1a-61f1-4043-bf83-b5c94c648137
smartctl.8.in, smartd.8.in, smartd.conf.5.in: Merge sections CONTRIBUTORS
and CREDITS with AUTHORS.

git-svn-id: https://svn.code.sf.net/p/smartmontools/code/trunk/smartmontools@3941 4ea69e1a-61f1-4043-bf83-b5c94c648137
smartctl.8.in, smartd.8.in, smartd.conf.5.in: Update SEE ALSO sections.

git-svn-id: https://svn.code.sf.net/p/smartmontools/code/trunk/smartmontools@3942 4ea69e1a-61f1-4043-bf83-b5c94c648137