98d292d632
List of changes: - renamed a section for clarity (WebExtensions Experiments -> Adding Experimental APIs in Privileged Extensions) - fixed a few typos because I think we should consistently use the name WebExtensions (with a `s`) when it is followed by API(s) at least - added a link to the xpi-manifest repo in a notice (main repo, not the `docs/` folder or a markdown file because that may change) - Experimental APIs is referenced in the section that has been edited so made it clear what is an Experimental API vs Built-in (hopefully). Also kept the reference to "WebExtensions Experiment" (which seems to be an alias) Differential Revision: https://phabricator.services.mozilla.com/D146537
