Pmm 862 update pr boilderplate
Review app: https://pmm-862-update-pr-boilderplate.about-src.gitlab.com/press/press-kit/#boilerplate
Follow on to https://gitlab.com/gitlab-com/marketing/product-marketing/issues/862 to update messaging:
Change
GitLab is a single application for the entire DevOps lifecycle
to
GitLab is a DevOps platform, delivered as a single application
!26346 (merged) updates most of the website.
The press boilerplate doesn't use the exact phrase "GitLab is a single application for the entire DevOps lifecycle". This MR proposes an update using "DevOps platform".
Edited by William Chia