API C SpellBook.GetOverrideSpell

Needs summary.
 overrideSpellID = C_SpellBook.GetOverrideSpell(spellID [, spec, onlyKnown, ignoreOverrideSpellID])
==Arguments==
:;spellID:
:;spec:
:;onlyKnown:
:;ignoreOverrideSpellID:
==Returns==
:;overrideSpellID: - Returns the spellID passed in if there is no override