net/http: fix typo in Response.Body field docs

Fixes #31096

Change-Id: I5b36bfc6d18eb8c1bbf15abcd92b0e6559cda3c8
Reviewed-on: https://go-review.googlesource.com/c/go/+/169683Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>

src/net/http/response.go

@@ -12,12 +12,13 @@ import (
 	"crypto/tls"
 	"errors"
 	"fmt"
-	"golang.org/x/net/http/httpguts"
 	"io"
 	"net/textproto"
 	"net/url"
 	"strconv"
 	"strings"
+
+	"golang.org/x/net/http/httpguts"
 )
 
 var respExcludeHeader = map[string]bool{
@@ -66,7 +67,7 @@ type Response struct {
 	// with a "chunked" Transfer-Encoding.
 	//
 	// As of Go 1.12, the Body will be also implement io.Writer
-	// on a successful "101 Switching Protocols" responses,
+	// on a successful "101 Switching Protocols" response,
 	// as used by WebSockets and HTTP/2's "h2c" mode.
 	Body io.ReadCloser