Suggestion:

Details about "Plugins.<PluginName>.System.Capacity" from here:
https://www.zabbix.com/documentation/6.4/en/manual/concepts/agent2
should moved (with a link) or duplicated here:
https://www.zabbix.com/documentation/6.4/en/manual/extensions/plugins#configuring-plugins

I mean details under "Check concurrency" chapter.

I see that location of these pages has been altered in v 6.4, which is nice, but I'm surprised to find the param details on 1st link, not 2nd one.

Another param - "Plugins.<Plugin name>.System.ForceActiveChecksOnStart" is also a candidate for suggested movement.