Update upgrade.md

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@ -22,7 +22,7 @@ bottom left corner of the screen changes. Wait until websocket indicators in
bottom right corner of the screen turn solid green. Navigate to bottom right corner of the screen turn solid green. Navigate to
`Setting> Engine Image` and wait until the new Engine Image is `Ready`. `Setting> Engine Image` and wait until the new Engine Image is `Ready`.
## Upgrade Engine Images ## Upgrade Longhorn engine
**ALWAYS MAKE BACKUPS BEFORE UPGRADE THE ENGINE IMAGES.** **ALWAYS MAKE BACKUPS BEFORE UPGRADE THE ENGINE IMAGES.**