ref-manual: Updates to BB_NUMBER_THREADS and PARALLEL_MAKE

I added some more detail to these two variables.  The system sets
them according to the perceived number of cores.  These default
setting are cool for single socket systems.  However, if you
have some big system with a lot of physical CPUs, you might want
to cap off the values at 20.  This is according to Darren Hart.

I also put in some cross-references to the "Speeding Up the Build"
section.

(From yocto-docs rev: 20eafc8290f46d8deea84dd6ff721b65cb8a1463)

Signed-off-by: Scott Rifenbark <scott.m.rifenbark@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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