[web] Replace ' with ' in announcementStatements

Summary: ' was appearing on the page instead of an apostrophe. I'm guessing there's some sort of sanitization step that's escaping '?

Test Plan:
Before:

After:

Reviewers: ashoat, ginsu

Reviewed By: ashoat

Subscribers: tomek

Differential Revision: https://phab.comm.dev/D7893