doc: fix "used to sent" → "used to send" in http2

Signed-off-by: Daijiro Wachi <daijiro.wachi@gmail.com>

Author: watilde

doc/api/http2.md

@@ -1942,7 +1942,7 @@ server.on('stream', (stream) => {
 Initiates a response. When the `options.waitForTrailers` option is set, the
 `'wantTrailers'` event will be emitted immediately after queuing the last chunk
 of payload data to be sent. The `http2stream.sendTrailers()` method can then be
-used to sent trailing header fields to the peer.
+used to send trailing header fields to the peer.
 
 When `options.waitForTrailers` is set, the `Http2Stream` will not automatically
 close when the final `DATA` frame is transmitted. User code must call either
@@ -2065,7 +2065,7 @@ after a stream has finished is supported.
 
 When the `options.waitForTrailers` option is set, the `'wantTrailers'` event
 will be emitted immediately after queuing the last chunk of payload data to be
-sent. The `http2stream.sendTrailers()` method can then be used to sent trailing
+sent. The `http2stream.sendTrailers()` method can then be used to send trailing
 header fields to the peer.
 
 When `options.waitForTrailers` is set, the `Http2Stream` will not automatically
@@ -2270,7 +2270,7 @@ default behavior is to destroy the stream.
 
 When the `options.waitForTrailers` option is set, the `'wantTrailers'` event
 will be emitted immediately after queuing the last chunk of payload data to be
-sent. The `http2stream.sendTrailers()` method can then be used to sent trailing
+sent. The `http2stream.sendTrailers()` method can then be used to send trailing
 header fields to the peer.
 
 When `options.waitForTrailers` is set, the `Http2Stream` will not automatically