dev-manual: Updates to section on multiconfig builds

* Added qualifying text indicating that you can build images or
packages.  In other words, the multiconfig does not necessarily
have to be an image.  It can be a package as well.

* Added qualifying text describing that it is not a requirement
to have separate TMPDIRs for each multiconfig.  I used a build
for two multiconfigs of "qemux86" for different DISTROs as
a case.

(From yocto-docs rev: 6e5ed0d1ab305c3382fea55fc1a2deaac0b7d518)

Signed-off-by: Scott Rifenbark <srifenbark@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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