sandbox.md

-This is a test for tpo/tpa/wiki-replica#1.
+This page is a "sandbox", a mostly empty page to test things in the
+wiki.
 
-It can also be used to send fake commits on markdown files to trigger
-the mdlint checks.
+It's a good page to modify in order to send fake commits on markdown
+files to trigger the `mdlint` checks or other builds.