Describe type + reason introduced in NeoForge 20.4.40-beta

[shartte]

See neoforged/FancyModLoader#51

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[IchHabeHunger54]

Looks good in general. Three minor nitpicks:

• Please remove the "Replaced the mandatory field in NeoForge 20.4.40-beta". We assume people reading the docs to be on latest NeoForge.
• AFAICT the type value must be encased in "" (this is not the case in the example).
• Please add a simple example for the reason, something like reason="This mod is not compatible with <other mod> because both touch rendering internals in a non-compatible way."

[shartte]

Looks good in general. Three minor nitpicks:

* Please remove the "Replaced the `mandatory` field in NeoForge 20.4.40-beta". We assume people reading the docs to be on latest NeoForge.

* AFAICT the type value must be encased in "" (this is not the case in the example).

* Please add a simple example for the reason, something like `reason="This mod is not compatible with <other mod> because both touch rendering internals in a non-compatible way."`

Did 1) and 2), but will not do 3) since I'll leave that up to further improvement ;)