[bug #54101] documentation for .ss either incorrect or incomplete

[Dave]

Follow-up Comment #1, bug #54101 (project groff):

The other possibility is that the documentation is correct, and groff's
noncompliance with it is a bug.

Modern typography does not add additional space between sentences.  To emulate
that, documents cannot use the default .ss setting; they must explicitly
invoke this request and pass 0 as its second parameter.  Groff should (and
seems to) treat this 0 as fixed rather than stretchable.

In traditional typography, I don't know whether the extra sentence space was
of fixed width, or adjusted proportionately with the word space.  But when
using a nonzero SENTENCE_SPACE_SIZE, groff should probably follow historical
practice in this regard.

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