docs: tweak "manpage" (shared) Return, SConscript [ci skip]

After previous updates, the manpage part (also shared to the
userguide) was a little less precise than it could be.
SConscript definition now describes the return value more
accurately (e.g. add what happens if multiple scripts called)
and moved to its own paragraph (at end) rather than inline.

Signed-off-by: Mats Wichmann <mats@linux.com>

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