[bug #62801] [me] doc/meref.me.in: Clarify a couple points about empty macro arguments

[Dave]

Follow-up Comment #1, bug #62801 (project groff):

[comment #0 original submission:]
> A few -me macros (... .sh, ....) accept empty arguments, but the
> _me Reference Manual_ doesn't say how to pass an empty argument
> to a roff macro.

More nitpickally, for its string argument T, .sh accepts an empty value (with
undocumented syntax); for its numeric arguments a-f, .sh documents two
different ways to specify no value (hyphen or 0), each of which has a
different meaning.


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