Remove single-space hard sentence breaks. These degrade the quality
of the typeset output, tend to make diffs harder to read and provide
bad examples for new-comers to mdoc.

Add new manpages for:
microtime(9)
nanotime(9)
getmicrotime(9)
getnanotime(9)
microuptime(9)
nanouptime(9)
getmicrouptime(9)
getnanouptime(9)
tvtohz(9)

Based on PR: docs/15889
Submitted by:

Add new manpages for:
microtime(9)
nanotime(9)
getmicrotime(9)
getnanotime(9)
microuptime(9)
nanouptime(9)
getmicrouptime(9)
getnanouptime(9)
tvtohz(9)

Based on PR: docs/15889
Submitted by: Kelly Yancey <kbyanc@posi.net>

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