[landing] address keybase comparison touch ups

Summary:
resolves the following keybase comparison copy:

https://linear.app/comm/issue/ENG-4624/keybase-comparison

Depends on D8784

Test Plan:
Please see the screenshots:

Reviewers: atul, kamil, ashoat

Reviewed By: ashoat

Subscribers: ashoat, tomek

Differential Revision: https://phab.comm.dev/D8785