C docs: fadeVolume() is missing userdata

SDK Bug Reports
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1

The title says it all.

2.6.0 Docs:

void playdate->sound->fileplayer->fadeVolume(FilePlayer* player, float left, float right, int32_t len, sndCallbackProc finishCallback);

sound.h:

void (*fadeVolume)(FilePlayer* player, float left, float right, int32_t len, sndCallbackProc finishCallback, void* userdata);