Update security.rst

Author: rcapile

security.rst

@@ -270,8 +270,9 @@ important section is ``firewalls``:
                     pattern="^/(_(profiler|wdt)|css|images|js)/"
                     security="false"/>
 
-                <firewall name="main">
-                    <anonymous lazy="true"/>
+                <firewall name="main"
+                    anonymous="true"
+                    lazy="true"/>
                 </firewall>
             </config>
         </srv:container>
@@ -286,7 +287,8 @@ important section is ``firewalls``:
                     'security' => false,
                 ],
                 'main' => [
-                    'anonymous' => 'lazy',
+                    'anonymous' => true,
+                    'lazy' => true,
                 ],
             ],
         ]);