updated go live date and docs

[robertsweetman]

A reference to the issue / Description of it

Update go-live date for PlanetFM and slightly tweak the docs for exactly what to change

How does this PR fix the problem?

Adds the date

How has this been tested?

Please describe the tests that you ran and provide instructions to reproduce.

Very low risk

Deployment Plan / Instructions

Will this deployment impact the platform and / or services on it?

Nope

Checklist (check x in [ ] of list items)

• I have performed a self-review of my own code
• All checks have passed
• I have made corresponding changes to the documentation
• Plan and discussed how it should be deployed to PROD (If needed)

Additional comments (if any)

{Please write here}

[github-actions]

Please check the plan carefully before deploying these changes.

⚠️ Making changes to the environments/*.json files will affect MP AWS accounts, for more information on the potential impact of these changes consult the documentation.

[github-actions]

Trivy Scan Success

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Trivy will check the following folders:

</details> #### `Checkov Scan` Success
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CTFLint Scan Success

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Setting default tflint config...
Running tflint --init...
Installing "terraform" plugin...
Installed "terraform" (source: github.com/terraform-linters/tflint-ruleset-terraform, version: 0.5.0)
tflint will check the following folders:

Trivy Scan Success

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Trivy will check the following folders:

[ewastempel]

LGTM