Agora RTC Objective-C API Reference Refactor

Here is a list of all struct and union fields with links to the structures/unions they belong to:

### - n -

- name : SrcInfo , AgoraMediaPlayerSrcInfo , AgoraMusic
- network_transport_delay : RemoteAudioTrackStats
- networkTransportDelay : RemoteAudioStats , AgoraRtcRemoteAudioStats
- new_e2e_delay_ms : RemoteAudioTrackStats
- newStart : AgoraRtmGetHistoryMessagesResponse
- next() : IIterator
- nextPage : AgoraRtmGetOnlineUsersResponse , AgoraRtmWhoNowResponse
- None : IRtmpLocalUser
- NS_DELAY : ILocalUser
- NS_LEVEL : ILocalUser
- NS_MODE : ILocalUser
- NS_UNAVAILABLE : AgoraRtmClientConfig , AgoraRtmClientKit , AgoraRtmHistory , AgoraRtmLock , AgoraRtmPresence , AgoraRtmProxyConfig , AgoraRtmStorage , AgoraRtmStreamChannel
- NsNG : ILocalUser
- NsNGStatistical : ILocalUser
- ntpFracPerSecond : NtpTime
- NtpTime() : NtpTime
- ntpTimeMs : AudioPcmDataInfo
- nullopt_t() : nullopt_t
- num_channels : IScreenCaptureSource::AudioCaptureConfig , RemoteAudioTrackStats
- num_channels_ : AudioPcmFrame
- number_of_streams : LocalVideoTrackStats
- numberOfChannels : EncodedAudioFrameInfo , RtmpStreamingAudioConfiguration
- numChannels : LocalAudioStats , RemoteAudioStats , AgoraRtcLocalAudioStats , AgoraRtcRemoteAudioStats