Update standard boilerplate with new 30M users stats

Why is this change being made?

Per @nwoods1 and the comms team, we need to remove the 100K orgs number and replace with: “GitLab has an estimated 30 million+ users (both Paid and Free) from startups to global enterprises”

This MR suggests some changes to our standard boilerplate messaging that we link to from our Press Kit, and which we use in lots of externally facing messaging, including OSS events.

Author Checklist

• Provided a concise title for the MR
• Added a description to this MR explaining the reasons for the proposed change, per say-why-not-just-what
• Assign this change to the correct DRI
  • If the DRI for the page/s being updated isn’t immediately clear, then assign it to one of the people listed in the "Maintained by" section in on the page being edited.
  • If your manager does not have merge rights, please ask someone to merge it AFTER it has been approved by your manager in #mr-buddies.
  • If the changes relate to any part of the project other than updates to content and/or data files please make sure to ping @gl-static-site-editor in a comment for a review and merge. For example changes to .gitlab-ci.yml, JavaScript/CSS/Ruby code or the layout files. (this requirement has been removed pending identification of a new DRI for the handbook)