Fix "rockship" typo in docs

Created by: lguychard

Test plan

Read docs, verify that "rockskip" is correctly spelled.

Created by: olafurpg

Review: Approved

Merged by: lguychard at 2022-08-24 07:48:09 UTC

Created by: chrismwendt

Review: Commented

Oof, good catch! BTW I nominate lg/rockship-ready-for-takeoff for Best Branch Name