Docs | Integration Patterns: Update Allocating based on GameServer Player Capacity to use Lists

[markmandel]

Dependent on:

• Counters & Lists landing page and doc improvements #3649

Update https://agones.dev/site/docs/integration-patterns/player-capacity/ to use a List with players key.

I'd probably suggest keeping the docs using Player Tracking, but maybe at the bottom of the page under some kind of warning.

[github-actions]

'This issue is marked as Stale due to inactivity for more than 30 days. To avoid being marked as 'stale' please add 'awaiting-maintainer' label or add a comment. Thank you for your contributions '

[markmandel]

This has been on my plate for a while. I should get to this.