Add notes on updating Linux container image

[everystone]

After pushing a new docker image to the registry, the only way I have found to update the linux container image is to delete the build. That means I also have to remove the build from matchmaking queue, and recreate it. I feel like this should be easier, or am I wrong?

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• ID: bcabece8-1aad-5ad7-908d-4416085ee2ab
• Version Independent ID: c63c3457-4aa3-0c86-302f-b1215d0875aa
• Content: Deploy builds using Game Manager - PlayFab
• Content Source: playfab-docs/features/multiplayer/servers/deploy-using-game-manager.md
• Product: playfab
• GitHub Login: @joannaleecy
• Microsoft Alias: joanlee