R1:fef3e074d8d2

Move #888 and #999 to $lightgreytext

Summary: Moves lighter grey text to a common color.

Test Plan: sandbox, review diff

Reviewers: epriestley, btrahan, mutech.aka

Reviewed By: mutech.aka

CC: Korvin, aran

Differential Revision: https://secure.phabricator.com/D6859