[Docs] Add initialState and hideBuff to buffTarget effect docs

[Lyeeedar]

Summary

This PR updates the buffTarget effect documentation in docs/combat/effects.md to reflect a recent game change.

Changes

docs/combat/effects.md

• buffTarget: Added hideBuff?: true and initialState?: Record<string, Scaling> to the type signature and code example. Added explanatory note linking to the existing initialState on buffSelf.

Game Change Trigger

Commit 0f16b6e7b — ModAPI: add initialState property to the CreateBuffTargetEffect like in the CreateBuffSelfEffect (#8736)

The initialState property was added to CreateBuffTargetEffect (buff effect) and BuffTargetTechniqueEffect (technique effect), matching the field already present on buffSelf. This allows modders to seed a debuff's internalState with values computed from the technique's scaling context at application time.

Rotating Review

This run reviewed the combat area (effects documentation).

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