R1:b8cd5b0eb89a

Use a less-esoteric spelling of "capabilities" in several places

Summary: This spelling can definitely feel a little overplayed at times, but I still think it's a gold standard in spellings of "capabilities".

Test Plan: Felt old and uncool.

Reviewers: chad

Reviewed By: chad

Differential Revision: https://secure.phabricator.com/D18215