Man pages matching name curlopt_rtsp_stream_uri in section 3:

CURLOPT_RTSP_STREAM_URI.3.en	debian 10 / libcurl4-doc
CURLOPT_RTSP_STREAM_URI.3.en	debian 11 / libcurl4-doc
CURLOPT_RTSP_STREAM_URI.3.en	debian 12 / libcurl4-doc