Add mention of elsecan and elsecannot directives

This is just a draft (making a point) and should be rewritten because
section below does not mention anything about these two directives.

 - mentioning use of @else directive in between @can and @endcan might
be also useful

Author: Kyslik

authorization.md

@@ -292,14 +292,18 @@ As previously discussed, some actions like `create` may not require a model inst
 <a name="via-blade-templates"></a>
 ### Via Blade Templates
 
-When writing Blade templates, you may wish to display a portion of the page only if the user is authorized to perform a given action. For example, you may wish to show an update form for a blog post only if the user can actually update the post. In this situation, you may use the `@can` and `@cannot` directives.
+When writing Blade templates, you may wish to display a portion of the page only if the user is authorized to perform a given action. For example, you may wish to show an update form for a blog post only if the user can actually update the post. In this situation, you may use the `@can` and `@cannot` directives as well as `@elsecan` and `@elsecannot`.
 
     @can('update', $post)
         <!-- The Current User Can Update The Post -->
+    @elsecan('create', $post)
+        <!-- The Current User Can Create New Post -->
     @endcan
 
     @cannot('update', $post)
         <!-- The Current User Can't Update The Post -->
+    @elsecannot('create', $post)
+        <!-- The Current User Can't Create New Post -->
     @endcannot
 
 These directives are convenient shortcuts for writing `@if` and `@unless` statements. The `@can` and `@cannot` statements above respectively translate to the following statements: