nghttp2.h: mention where user_data is set in the send_callback docs
Just to make it easier to find the info.
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@ -787,7 +787,9 @@ typedef union {
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* not used and always 0. It must return the number of bytes sent if
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* it succeeds. If it cannot send any single byte without blocking,
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* it must return :enum:`NGHTTP2_ERR_WOULDBLOCK`. For other errors, it
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* must return :enum:`NGHTTP2_ERR_CALLBACK_FAILURE`.
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* must return :enum:`NGHTTP2_ERR_CALLBACK_FAILURE`. The |user_data| pointer
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* is the third argument passed in to the call to nghttp2_session_client_new
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* or nghttp2_session_server_new
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*/
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typedef ssize_t (*nghttp2_send_callback)
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(nghttp2_session *session,
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