docs: how to update from pre-3.0.0

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+This is the tutorial to upgrade any existing server from a version prior to the [3.0.0 release](https://github.com/azerothcore/azerothcore-wotlk/releases/tag/v3.0.0) to the latest `master` version.
+
+**Note**: it is always recommended to backup your database before doing ANY update.
+
+### Step 1. Upgrade to last 3.0.0 commit
+
+You need first to update your server to [this commit](https://github.com/azerothcore/azerothcore-wotlk/commit/2d609e9e48b2e516e4a555015b2662cab15b0c38), running:
+
+`git checkout 2d609e9e48b2e516e4a555015b2662cab15b0c38`
+
+Now update your **database** as you usually do (e.g. using the db-assembler)
+
+### Step 2. Upgrade to latest master
+
+Update to latest master:
+
+`git checkout master; git pull;`
+
+**Note**: if you are using your own fork of AC, as usual, you have to [sync it](Syncing-your-fork)
+
+Now update your **core and database** (again) as [you normally do](Update).