docs(p2p,node): fix typos ethereum#21118 (#2419)

Author: gzliudan

node/jwt_handler.go

@@ -31,7 +31,7 @@ type jwtHandler struct {
 	next    http.Handler
 }
 
-// newJWTHandler creates a http.Handler with jwt authentication support.
+// newJWTHandler creates an http.Handler with jwt authentication support.
 func newJWTHandler(secret []byte, next http.Handler) http.Handler {
 	return &jwtHandler{
 		keyFunc: func(token *jwt.Token) (interface{}, error) {

p2p/dnsdisc/client.go

@@ -248,7 +248,7 @@ func (it *randomIterator) Next() bool {
 	return it.cur != nil
 }
 
-// addTree adds a enrtree:// URL to the iterator.
+// addTree adds an enrtree:// URL to the iterator.
 func (it *randomIterator) addTree(url string) error {
 	le, err := parseLink(url)
 	if err != nil {

p2p/rlpx_test.go

@@ -54,7 +54,7 @@ func TestSharedSecret(t *testing.T) {
 	}
 	t.Logf("Secret:\n%v %x\n%v %x", len(ss0), ss0, len(ss0), ss1)
 	if !bytes.Equal(ss0, ss1) {
-		t.Errorf("dont match :(")
+		t.Errorf("don't match :(")
 	}
 }