Polish "OAuth2 client secret should not be required"

Closes gh-14156

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/security/oauth2/client/OAuth2ClientPropertiesTests.java

@@ -45,7 +45,7 @@ public class OAuth2ClientPropertiesTests {
 	}
 
 	@Test
-	public void clientSecretAbsentNotThrowsException() {
+	public void clientSecretAbsentShouldNotThrowException() {
 		OAuth2ClientProperties.Registration registration = new OAuth2ClientProperties.Registration();
 		registration.setClientId("foo");
 		registration.setProvider("google");