Remove note about manually building docker images as that is handled by our dependencies.
Remove note about manually building docker images as that is handled by our dependencies.

Reviewers: ciera

Reviewed By: ciera

Differential Revision: https://phabricator-dot-shipshapecode.appspot.com/D158

google/shipshape,google/shipshape,google/shipshape,google/shipshape,google/shipshape,google/shipshape,google/shipshape