Update godoc example func to properly refer to NewWithClaims() (#459)

* Update example to include the New() function rather than the NewWithClaims() function

* Change func name to ExampleNewWithClaims

Author: equalsgibson

hmac_example_test.go

@@ -24,14 +24,13 @@ func init() {
 }
 
 // Example creating, signing, and encoding a JWT token using the HMAC signing method
-func ExampleNew_hmac() {
+func ExampleNewWithClaims_hmac() {
 	// Create a new token object, specifying signing method and the claims
 	// you would like it to contain.
 	token := jwt.NewWithClaims(jwt.SigningMethodHS256, jwt.MapClaims{
 		"foo": "bar",
 		"nbf": time.Date(2015, 10, 10, 12, 0, 0, 0, time.UTC).Unix(),
 	})
-
 	// Sign and get the complete encoded token as a string using the secret
 	tokenString, err := token.SignedString(hmacSampleSecret)