[docs] add compilation bits to the bitsandbytes docs. (#11693)
* add compilation bits to the bitsandbytes docs.
* Apply suggestions from code review
Co-authored-by: Steven Liu <59462357+stevhliu@users.noreply.github.com>
* finish
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Co-authored-by: Steven Liu <59462357+stevhliu@users.noreply.github.com>