man3/t-v.3: srcfix: Use a single-font-style macro for a single argument

man3/t-v.3: srcfix: Use a single-font-style macro for a single argument

  Use a single-font-style macro (".B", ".I") for a single argument.

  Remove unneeded quotation marks (").

  The output from "nroff" and "groff" is unchanged, except for the change

1) '-1' to '\-1' in the file "timegm.3"

2) to separate ',' from a word in the file "uselocale.3".

Signed-off-by: Bjarni Ingi Gislason <bjarniig@rhi.hi.is>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>