Fix grammar and typos from review.
Fix grammar and typos from review.

Co-authored-by: Richard van der Hoff <6e2e234be92ed8dc85f875dbc2f9b6424da7a211@users.noreply.github.com>
matrix-org/matrix-doc,matrix-org/matrix-doc,matrix-org/matrix-doc,matrix-org/matrix-doc