Update mg_send_websocket_framev.md

docs/c-api/http.h/mg_send_websocket_framev.md

@@ -7,7 +7,7 @@ signature: |
                                 const struct mg_str *strings, int num_strings);
 ---
 
-Send multiple websocket frames.
+Sends multiple WebSocket frames.
 
 Like `mg_send_websocket_frame()`, but composes a frame from multiple buffers.