Management documentation updates

[craddm]

✅ Checklist

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🚦 Depends on

⤴️ Summary

Updates various documentation sections to provide additional detail.

Specifically, it expands upon data egress/ingress procedures and tearing down of SHMs and SREs.

🌂 Related issues

Contributes to #2252
Closes #2146

🔬 Tests

Documentation only

[github-actions]

Coverage report

This PR does not seem to contain any modification to coverable code.

[JimMadge]

This is looking good.

I think there are some changes we should make to keep it within scope and a few corrections.

[JimMadge]

A few small suggestions but I think this is ready 👍

[JimMadge]

LGTM 👍.