x/crypto: fix typos

The typos were found by misspell tool.

Change-Id: I120740f12f7ba48330749ebf84050a7b98e01016
Reviewed-on: https://go-review.googlesource.com/24725
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>

ssh/test/session_test.go

@@ -289,7 +289,7 @@ func TestCiphers(t *testing.T) {
 		defer server.Shutdown()
 		conf := clientConfig()
 		conf.Ciphers = []string{ciph}
-		// Don't fail if sshd doesnt have the cipher.
+		// Don't fail if sshd doesn't have the cipher.
 		conf.Ciphers = append(conf.Ciphers, cipherOrder...)
 		conn, err := server.TryDial(conf)
 		if err == nil {
@@ -310,7 +310,7 @@ func TestMACs(t *testing.T) {
 		defer server.Shutdown()
 		conf := clientConfig()
 		conf.MACs = []string{mac}
-		// Don't fail if sshd doesnt have the MAC.
+		// Don't fail if sshd doesn't have the MAC.
 		conf.MACs = append(conf.MACs, macOrder...)
 		if conn, err := server.TryDial(conf); err == nil {
 			conn.Close()
@@ -328,7 +328,7 @@ func TestKeyExchanges(t *testing.T) {
 		server := newServer(t)
 		defer server.Shutdown()
 		conf := clientConfig()
-		// Don't fail if sshd doesnt have the kex.
+		// Don't fail if sshd doesn't have the kex.
 		conf.KeyExchanges = append([]string{kex}, kexOrder...)
 		conn, err := server.TryDial(conf)
 		if err == nil {

ssh/test/testdata_test.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// IMPLEMENTOR NOTE: To avoid a package loop, this file is in three places:
+// IMPLEMENTATION NOTE: To avoid a package loop, this file is in three places:
 // ssh/, ssh/agent, and ssh/test/. It should be kept in sync across all three
 // instances.