Various pages: srcfix: trim a trailing space

Various pages: srcfix: trim a trailing space

Output is from: test-groff -b -e -mandoc -T utf8 -rF0 -t -w w -z

  [ "test-groff" is a developmental version of "groff" ]

  There is no change in the output of "nroff" and "groff".

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troff: <fts.3>:50: warning: trailing space
####

troff: <getgrnam.3>:175: warning: trailing space
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troff: <getpwnam.3>:181: warning: trailing space
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troff: <rcmd.3>:52: warning: trailing space
troff: <rcmd.3>:57: warning: trailing space
troff: <rcmd.3>:60: warning: trailing space
troff: <rcmd.3>:63: warning: trailing space
troff: <rcmd.3>:69: warning: trailing space
troff: <rcmd.3>:73: warning: trailing space
####

troff: <rexec.3>:48: warning: trailing space
troff: <rexec.3>:51: warning: trailing space
####

troff: <sem_open.3>:36: warning: trailing space

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