Update Documentation on master

VLCKit/Headers/Public/VLCTranscoder.h:33: warning: Compound VLCTranscoderDelegate-p is not documented.
VLCKit/Headers/Public/VLCLibrary.h:131: warning: argument 'error' of command @param is not found in the argument list of <VLCLibraryLogReceiverProtocol>::handleMessage:debugLevel:(NSString *message, [debugLevel] int level)
VLCKit/Headers/Public/VLCLibrary.h:125: warning: The following parameters of -[VLCLibraryLogReceiverProtocol-p handleMessage:debugLevel:](NSString *message, [debugLevel] int level) are not documented:
VLCKit/Headers/Public/VLCRendererDiscoverer.h:85: warning: Member NS_UNAVAILABLE() (function) of class VLCRendererDiscoverer is not documented.
VLCKit/Headers/Public/VLCRendererDiscoverer.h:125: warning: Member rendererDiscovererItemAdded:item:(VLCRendererDiscoverer *rendererDiscoverer, [item] VLCRendererItem *item) (function) of class VLCRendererDiscovererDelegate-p is not documented.
VLCKit/Headers/Public/VLCRendererDiscoverer.h:125: warning: Member rendererDiscovererItemDeleted:item:(VLCRendererDiscoverer *rendererDiscoverer, [item] VLCRendererItem *item) (function) of class VLCRendererDiscovererDelegate-p is not documented.```

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