all: fix some comments

Change-Id: I005e210f0ae030c507b4bfd1548c5a885df4c6b9
Reviewed-on: https://go-review.googlesource.com/c/net/+/493155
Run-TryBot: shuang cui <imcusg@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Run-TryBot: Ian Lance Taylor <iant@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>

Author: cuishuang

http2/h2c/h2c.go

@@ -44,7 +44,7 @@ func init() {
 // HTTP/1, but unlikely to occur in practice and (2) Upgrading from HTTP/1 to
 // h2c - this works by using the HTTP/1 Upgrade header to request an upgrade to
 // h2c. When either of those situations occur we hijack the HTTP/1 connection,
-// convert it to a HTTP/2 connection and pass the net.Conn to http2.ServeConn.
+// convert it to an HTTP/2 connection and pass the net.Conn to http2.ServeConn.
 type h2cHandler struct {
 	Handler http.Handler
 	s       *http2.Server

http2/server.go

@@ -2429,7 +2429,7 @@ type requestBody struct {
 	conn          *serverConn
 	closeOnce     sync.Once // for use by Close only
 	sawEOF        bool      // for use by Read only
-	pipe          *pipe     // non-nil if we have a HTTP entity message body
+	pipe          *pipe     // non-nil if we have an HTTP entity message body
 	needsContinue bool      // need to send a 100-continue
 }
 
@@ -2774,7 +2774,7 @@ func (w *responseWriter) FlushError() error {
 		err = rws.bw.Flush()
 	} else {
 		// The bufio.Writer won't call chunkWriter.Write
-		// (writeChunk with zero bytes, so we have to do it
+		// (writeChunk with zero bytes), so we have to do it
 		// ourselves to force the HTTP response header and/or
 		// final DATA frame (with END_STREAM) to be sent.
 		_, err = chunkWriter{rws}.Write(nil)

http2/transport.go

@@ -1899,7 +1899,7 @@ func (cc *ClientConn) encodeHeaders(req *http.Request, addGzipHeader bool, trail
 		// 8.1.2.3 Request Pseudo-Header Fields
 		// The :path pseudo-header field includes the path and query parts of the
 		// target URI (the path-absolute production and optionally a '?' character
-		// followed by the query production (see Sections 3.3 and 3.4 of
+		// followed by the query production, see Sections 3.3 and 3.4 of
 		// [RFC3986]).
 		f(":authority", host)
 		m := req.Method

webdav/if.go

@@ -24,7 +24,7 @@ type ifList struct {
 
 // parseIfHeader parses the "If: foo bar" HTTP header. The httpHeader string
 // should omit the "If:" prefix and have any "\r\n"s collapsed to a " ", as is
-// returned by req.Header.Get("If") for a http.Request req.
+// returned by req.Header.Get("If") for an http.Request req.
 func parseIfHeader(httpHeader string) (h ifHeader, ok bool) {
 	s := strings.TrimSpace(httpHeader)
 	switch tokenType, _, _ := lex(s); tokenType {