[landing] update Privacy Policy content

Summary:
Updating content to this shared in ENG-2421

The last part of PDF starting with For more information on how Comm Technologies processes information... is not needed.

Test Plan: See if content match shared PDF, looks good, and readable.

Reviewers: ginsu, ashoat, tomek, inka

Reviewed By: ashoat

Subscribers: ashoat, tomek, atul

Differential Revision: https://phab.comm.dev/D6394