Refer <gcAllowVeryLargeObjects> element (#1293)

* Refer <gcAllowVeryLargeObjects> element

The current version miss to tell what element should be changed to change the array limit

* Update xml/System.Collections.Generic/HashSet`1.xml

Co-Authored-By: DiegoQueiroz <queiroz.diego@gmail.com>

Author: DiegoQueiroz

xml/System.Collections.Generic/HashSet`1.xml

@@ -91,7 +91,7 @@
   
  In addition to the listed set operations, the <xref:System.Collections.Generic.HashSet%601> class also provides methods for determining set equality, overlap of sets, and whether a set is a subset or superset of another set.  
   
- For very large <xref:System.Collections.Generic.HashSet%601> objects, you can increase the maximum capacity to 2 billion elements on a 64-bit system by setting the `enabled` attribute of the  configuration element to `true` in the run-time environment.  
+**.NET Framework only:** For very large <xref:System.Collections.Generic.HashSet%601> objects, you can increase the maximum capacity to 2 billion elements on a 64-bit system by setting the `enabled` attribute of the [`<gcAllowVeryLargeObjects>`}(~/docs/framework/configure-apps/file-schema/runtime/gcallowverylargeobjects-element.md) configuration element to `true` in the run-time environment.  
   
  Starting with the [!INCLUDE[net_v40_long](~/includes/net-v40-long-md.md)], the <xref:System.Collections.Generic.HashSet%601> class implements the <xref:System.Collections.Generic.ISet%601> interface.  
   
@@ -2167,4 +2167,4 @@
       </Docs>
     </Member>
   </Members>
-</Type>
+</Type>