[RTC 4.6.0 API refs and release notes]

[Suri539]

Hi there, the English docs of API refs and release are ready for review.

Please generate the api refs based on this tag, which includes all doc fixes since last update: https://github.com/AgoraIO/agora_doc_source/releases/tag/v4.6.0-source

The release notes are located in the same old folder:
https://github.com/AgoraIO/agora_doc_source/tree/4.6.0-releasenotes/markdown/RTC%204.x/release-notes/en-US/native

[Suri539]

Hi, there are two updates about the English source:
release notes: AgoraIO/agora_doc_source@a6873bf
API ref: please generate the api ref based on the latest commit on the master branch AgoraIO/agora_doc_source@916bf16