[Groff] groff manpage typo

[Joerg van den Hoff]

hi,

there is a typo (sort of) in the manpage. concerning the '-Z' option it
reads:

-Z     Do not postprocess the output of troff that is  normally  called
       automatically by groff.  This will print the intermediate output
       to standard output; see groff_out(5).

the first sentence is broken AFAIKS. maybe it could read, for instance:

"Do not postprocess the output of troff (as is normally done 
automatically).This will print ..."

or, alternatively:

"Do not call any postprocessors (by default, grops(1) is otherwise 
called automatically) and print the intermediate output to stdout, see 
groff_out(5)."