Fix typo

Closes gh-827

Author: Daniel

spring-security-oauth2/src/main/java/org/springframework/security/oauth2/config/annotation/web/configuration/AuthorizationServerEndpointsConfiguration.java

@@ -82,7 +82,7 @@ public void init() {
 			try {
 				configurer.configure(endpoints);
 			} catch (Exception e) {
-				throw new IllegalStateException("Cannot configure enpdoints", e);
+				throw new IllegalStateException("Cannot configure endpoints", e);
 			}
 		}
 		endpoints.setClientDetailsService(clientDetailsService);