Fix some man page section assignments mixed in current docs, and other doc retouch #2978
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docs/man/linkman*.txt
files #2976 to report whichDOC_INSTALL_SELECTED_MANS_PROGS_BUILT
setting is in effect when listing an index of NUT programs.Note: separated from work originally done in #2977 (which has some more questionable changes about man section assignment); will serve as basis for that PR.