Fix Error Message typo

Fixes gh-3953

config/src/main/java/org/springframework/security/config/authentication/AuthenticationManagerFactoryBean.java

@@ -40,7 +40,7 @@ import java.util.Arrays;
 public class AuthenticationManagerFactoryBean implements
 		FactoryBean<AuthenticationManager>, BeanFactoryAware {
 	private BeanFactory bf;
-	public static final String MISSING_BEAN_ERROR_MESSAGE = "Did you forget to add a gobal <authentication-manager> element "
+	public static final String MISSING_BEAN_ERROR_MESSAGE = "Did you forget to add a global <authentication-manager> element "
 			+ "to your configuration (with child <authentication-provider> elements)? Alternatively you can use the "
 			+ "authentication-manager-ref attribute on your <http> and <global-method-security> elements.";