Updated Don't upgrade Docker container to develop or nightly (markdown)

Docker---Why-not-to-use-Develop-or-Nightly.md

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+If you choose to be on develop or nightly branch and use Docker, **DO NOT UPDATE THE CONTAINER**. 
+
+Doing so will downgrade your version and thereby might cause issues with the database.
+
+Same rule applies to **EVERY** docker container you'll ever use if you use the built in updaters.
+

Don't-upgrade-Docker-container-to-develop-or-nightly.md

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-If you choose to be on develop or nightly branch and use Docker, **DO NOT UPDATE THE CONTAINER**. 
-Doing so will downgrade and thereby might cause issues with the database.
-Same rule applies to EVERY docker container you ever use if you use the built in updaters.