Agora RTC Objective-C API Reference Refactor

### - r -

- range : ColorSpace
- rawStreamUrl : PublisherConfiguration
- real_capture_fps : ScreenCaptureProfilingStatistics
- received_bitrate : RemoteAudioTrackStats
- received_bytes : RemoteAudioTrackStats , RemoteVideoTrackStats
- received_sample_rate : RemoteAudioTrackStats
- receivedBitrate : RemoteAudioStats , RemoteVideoStats , RemoteVideoTrackStats
- receivedSampleRate : RemoteAudioStats
- recorderInfoUpdateInterval : MediaRecorderConfiguration
- recordingChannel : AudioRecordingConfiguration
- rednessLevel : BeautyOptions , IVideoBeautyFilter::BeautyOptions
- ref_count_ : RefCountedObject< T > , RefCounter
- regionCount : VideoCompositingLayout
- regionRect : ScreenCaptureConfiguration
- regions : VideoCompositingLayout
- regulated_capture_frame_rate : LocalVideoTrackStats
- regulated_capture_height : LocalVideoTrackStats
- regulated_capture_width : LocalVideoTrackStats
- regulatedCaptureFrameHeight : LocalVideoStats
- regulatedCaptureFrameRate : LocalVideoStats
- regulatedCaptureFrameWidth : LocalVideoStats
- remoteJoined2PacketReceived : VideoRenderingTracingInfo
- remoteJoined2SetView : VideoRenderingTracingInfo
- remoteJoined2UnmuteVideo : VideoRenderingTracingInfo
- remoteUid : ExtensionInfo
- remoteUserUid : TranscodingVideoStream
- render_frame_rate : LocalVideoTrackStats
- rendererOutputFrameRate : LocalVideoStats , RemoteVideoStats , RemoteVideoTrackStats
- renderMode : VideoCanvas , VideoCompositingLayout::Region
- renderTimeMs : VideoFrame , IAudioFrameObserverBase::AudioFrame
- residual_echo_likelihood : ILocalUser::AudioProcessingStats
- residual_echo_likelihood_recent_max : ILocalUser::AudioProcessingStats
- rotation : ExternalVideoFrame , VideoFrame , EncodedVideoFrameInfo , VideoCanvas , VideoFrameData
- routing : AudioDeviceInfo
- rtpTimestamp : IAudioFrameObserverBase::AudioFrame
- rtt : LastmileProbeResult
- rtt_ms : ILocalUser::LocalAudioDetailedStats
- rxAudioBytes : RemoteAudioStats , RtcStats
- rxAudioKBitRate : RtcStats
- rxBytes : RtcStats
- rxKBitRate : RtcStats
- rxPacketLossRate : RtcStats
- rxStreamType : RemoteVideoStats , RemoteVideoTrackStats
- rxVideoBytes : RemoteVideoStats , RtcStats
- rxVideoKBitRate : RtcStats