Fix typos, link to stewardship, convert absolute links, remove HTML a elements

Merged username-removed-1653910 requested to merge 7022andre/www-gitlab-com:patch-446 into master

Fixed some typos and also the link to the stewardship page which moved to https://about.gitlab.com/stewardship. Changed absolute to relative links and removed HTML anchor elements.

Edited by username-removed-1653910