Merge pull request #571 from humanmade/backport-570-to-v19-branch

[Backport v19-branch] Add note about MySQL 8 to upgrade doc

other-docs/guides/upgrading/v19.md

@@ -77,6 +77,18 @@ There are new and improved features of interest to developers such as:
 - Native JavaScript module support,
 - Plugin dependencies, and more.
 
+#### MySQL 8.0 in Local Server
+
+Altis [Local Server](docs://local-server) now supports MySQL v8.0. New installations will use MySQL 8.0 by default, but
+you can choose between 5.7 and 8.0 while you do your testing. Switching to 8.0 will automatically upgrade your database.
+See the [Database documentation](docs://local-server/database.md) for details.
+
 ### Altis Core improvements
 
 We have incorporated many updates to modules and libraries in Altis to bring in important bug fixes and improvements.
+
+### Documentation
+
+Our developer focussed documentation has been improved again. As usual, feedback
+from our customers and partners is always welcome.
+Please [send us any feedback you have](mailto:[email protected]).