crypto/tls: normalize spelling of "ClientHello" in comments

Change-Id: I2b62fb37ae390c42682354eaa2a9d03159563b6d
Reviewed-on: https://go-review.googlesource.com/c/go/+/637179
Reviewed-by: Daniel McCarney <[email protected]>
Reviewed-by: Roland Shoemaker <[email protected]>
LUCI-TryBot-Result: Go LUCI <[email protected]>
Auto-Submit: Filippo Valsorda <[email protected]>
Reviewed-by: David Chase <[email protected]>

src/crypto/tls/common.go

@@ -456,7 +456,7 @@ type ClientHelloInfo struct {
 	SupportedVersions []uint16
 
 	// Extensions lists the IDs of the extensions presented by the client
-	// in the client hello.
+	// in the ClientHello.
 	Extensions []uint16
 
 	// Conn is the underlying net.Conn for the connection. Do not read
@@ -821,7 +821,7 @@ type Config struct {
 
 	// EncryptedClientHelloRejectionVerify, if not nil, is called when ECH is
 	// rejected by the remote server, in order to verify the ECH provider
-	// certificate in the outer Client Hello. If it returns a non-nil error, the
+	// certificate in the outer ClientHello. If it returns a non-nil error, the
 	// handshake is aborted and that error results.
 	//
 	// On the server side this field is not used.

src/crypto/tls/handshake_client.go

@@ -944,7 +944,7 @@ func (hs *clientHandshakeState) processServerHello() (bool, error) {
 }
 
 // checkALPN ensure that the server's choice of ALPN protocol is compatible with
-// the protocols that we advertised in the Client Hello.
+// the protocols that we advertised in the ClientHello.
 func checkALPN(clientProtos []string, serverProto string, quic bool) error {
 	if serverProto == "" {
 		if quic && len(clientProtos) > 0 {