[bug #63632] manpages: improve some wording and typesetting

[Dave]

Follow-up Comment #6, bug #63632 (project groff):

[comment #0 original submission:]
> Input file is ./src/preproc/refer/refer.1.man
> 
> Add a hair space (\^) around "|" to increase readability

The \^ escape sequence is not among the approved escapes listed in the
Portability section of groff_man(7).  The thin space \| is, though, and should
offer the legibility benefit you're after here.

> Input file is ./src/preproc/tbl/tbl.1.man
> 
> Add a hair space (\^) around "|" to increase readability
> 
> 1839:n|n\[rs]f[B]\[rs][tmu]\[rs]f[]n|difference
> 1856:n|n\f[B]\[tmu]\f[]n|difference

Adding such spaces here would be flat-out wrong.  These vertical bars are part
of the tbl syntax.  In the latter case they are formatted by tbl and do not
even appear in the output.  In the former, they're tbl input that is typeset
in a monospace font, where horizontal adjustments are inappropriate because
they spoil the vertical alignment of the character cells.


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