Fix a small number of tabs -> spaces

Not entirely sure how we got stuck with spaces rather than tabs, or if that's even a bad thing. There were a few lines that had tabs that needed to be fixed.
s/Accomodate/Accommodate
s/escpecially/especially
s/completition/completion
Trim php.ini down to contain the most important info.

This should make it easier to find settings that need to be changed rather than having to skim through a bunch of stuff looking for something relevant
Add a documentation notice to the top of php.ini