reduce the man(7) global indentation from 7n to 5n, see man_term.c rev. 1.197

delete the two pairs of extra blank lines from expected man(7) terminal
output that are no longer printed since man_term.c rev. 1.189

inevitable churn caused by the section title change

In groff, trying to redefine standard man(7) macros before .TH has no effect;
after .TH, it works. Trying to redefine standard mdoc(7) macros before .Dd
works when calling groff with the -mdoc comma

In groff, trying to redefine standard man(7) macros before .TH has no effect;
after .TH, it works. Trying to redefine standard mdoc(7) macros before .Dd
works when calling groff with the -mdoc command line option, but does not
when calling groff with -mandoc; after .Dd, it always works.

Arguably, one might call that buggy behaviour in groff, but it is very
unlikely that anybody will change groff in this respect (certainly, i'm
not volunteering). So let's be bug-compatible.

This fixes the vertical spacing in sox(1).

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