[bug #61432] [PATCH] [doc] fix explanations of units "em" and "en"

[Dave]

Follow-up Comment #1, bug #61432 (project groff):

I agree, it's important to clarify that an en is by definition half an em, and
its relation to the size of the letter n is more rule of thumb.

In the line of doc/groff.texi changed by this patch, I would also be tempted
to remove the italics on "approximately," as it's not clear what extra
information that imparts.  Is an italic "approximately" somehow more
approximate than a roman one?

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