Fix typos (#3527)

common/protocol/tls/cert/cert.go

@@ -19,7 +19,7 @@ import (
 //go:generate go run github.com/xtls/xray-core/common/errors/errorgen
 
 type Certificate struct {
-	// Cerificate in ASN.1 DER format
+	// certificate in ASN.1 DER format
 	Certificate []byte
 	// Private key in ASN.1 DER format
 	PrivateKey []byte

common/protocol/tls/sniff_test.go

@@ -147,7 +147,7 @@ func TestTLSHeaders(t *testing.T) {
 		header, err := SniffTLS(test.input)
 		if test.err {
 			if err == nil {
-				t.Errorf("Exepct error but nil in test %v", test)
+				t.Errorf("Expect error but nil in test %v", test)
 			}
 		} else {
 			if err != nil {