Update ServiceProvider.xml

To edit 'IServiceProvider' in <summary> tag to be a link.

Author: fcdeveloper00

xml/Microsoft.Extensions.DependencyInjection/ServiceProvider.xml

@@ -52,7 +52,7 @@
   </Attributes>
   <Docs>
     <summary>
-            The default IServiceProvider.
+            The default <see cref="T:System.IServiceProvider" />.
             </summary>
     <remarks>To be added.</remarks>
   </Docs>