`b2DestroyRecording` should be renamed to `b2Recording_Destroy` to match other functions

[HolyBlackCat]

All the other "destroy" functions are named b2Blah_Destroy and b2DestroyRecording is the only outlier, which trips up my binding generator. 🙂

[HolyBlackCat]

Similarly there are b2RecPlayer_Create and b2DynamicTree_Create, but other create functions are b2CreateBlah.