Port exception found in System.Composition.Hosting source comments to… (#2322)

* Port exception found in System.Composition.Hosting source comments to Docs

* Update xml/System.Composition.Hosting/CompositionHost.xml

Co-Authored-By: carlossanlop <[email protected]>

Author: carlossanlop

xml/System.Composition.Hosting/CompositionHost.xml

@@ -143,7 +143,8 @@
         <returns>
           <see langword="true" /> if the export was retrieved; otherwise, <see langword="false" />.</returns>
         <remarks></remarks>
+        <exception cref="T:System.Composition.Hosting.CompositionFailedException">There are too many exports.</exception>
       </Docs>
     </Member>
   </Members>
-</Type>
+</Type>