Fix dev branch switching when clone with --depth 1. Koenkk/zigbee2mqtt#14363

Author: Koenkk

docs/advanced/more/switch-to-dev-branch.md

@@ -21,7 +21,7 @@ cd /opt/zigbee2mqtt
 cp -R data data-backup
 
 # Update
-git fetch
+git fetch origin dev
 git checkout dev # Change 'dev' to 'master' to switch back to the release version
 git pull
 npm ci