net/http: fix spelling in documentation

Change-Id: I8b0924300eafe27de98975512a78a6527a92e446
Reviewed-on: https://go-review.googlesource.com/c/go/+/354729
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Trust: Damien Neil <dneil@google.com>

src/net/http/httputil/dump.go

@@ -292,7 +292,7 @@ func DumpRequest(req *http.Request, body bool) ([]byte, error) {
 // can detect that the lack of body was intentional.
 var errNoBody = errors.New("sentinel error value")
 
-// failureToReadBody is a io.ReadCloser that just returns errNoBody on
+// failureToReadBody is an io.ReadCloser that just returns errNoBody on
 // Read. It's swapped in when we don't actually want to consume
 // the body, but need a non-nil one, and want to distinguish the
 // error from reading the dummy body.

src/net/http/serve_test.go

@@ -6557,7 +6557,7 @@ func TestDisableKeepAliveUpgrade(t *testing.T) {
 
 	rwc, ok := resp.Body.(io.ReadWriteCloser)
 	if !ok {
-		t.Fatalf("Response.Body is not a io.ReadWriteCloser: %T", resp.Body)
+		t.Fatalf("Response.Body is not an io.ReadWriteCloser: %T", resp.Body)
 	}
 
 	_, err = rwc.Write([]byte("hello"))

src/net/http/transfer.go

@@ -1030,7 +1030,7 @@ func (b *body) registerOnHitEOF(fn func()) {
 	b.onHitEOF = fn
 }
 
-// bodyLocked is a io.Reader reading from a *body when its mutex is
+// bodyLocked is an io.Reader reading from a *body when its mutex is
 // already held.
 type bodyLocked struct {
 	b *body