docs: [1.X] fixes of PVP exceptions (round 2)

[michalChrobot]

This PR is a continuation of https://github.com/Unity-Technologies/com.unity.netcode.gameobjects/pull/3300 It focuses on fixing PVP errors related to PVP-151-1 "Public APIs should be documented" and all remaining PVP errors present in pvpExceptions.json file

We have 87 errors left from PVP-151-1 at the time of this PR creation. If anyone want's to add to it what we should do is:

1. Check errors present in pvpExceptions.json file (preferably under "PVP-150-1", choose some to fix
2. Address those errors and when making commit remove the fixed errors from pvpExceptions file The first commit of this PR is an example of how such process should look like

In general new CI implementation will catch all new errors like this so all we need to do is fix the present ones. This PR does not focus on PVP present in gold profile but if capacity allows, those can also be addressed.

Errors present in "PVP-41-1", "PVP-300-4" are to be expected so there is no need of fixing this one! Another thing is that we could ignore error related to missing APIs for tests (so TestHelpers, EditorTests, RuntimeTests) because those were made internal in 2.X version (that's why those errors are not popping by there). This does not affect users so we don't need to add anything there

Backport

This has its equivalent in https://github.com/Unity-Technologies/com.unity.netcode.gameobjects/pull/3375