Editing WoW:API IsInInstance

{{wowapi}} __NOTOC__
Checks whether the player is in an instance and the type of instance.
 inInstance, instanceType = IsInInstance()

== Returns ==
;inInstance : Boolean - Whether the player is in an instance; nil otherwise.
;instanceType : String - The instance type:
;:* "none" when outside an instance
;:* "pvp" when in a battleground
;:* "arena" when in an arena
;:* "party" when in a 5-man instance
;:* "raid" when in a raid instance
;:* nil when in an unknown kind of instance, eg. in a scenario

== Details ==
This functon returns correct results immediately upon PLAYER_ENTERING_WORLD.