Port triple slash comment from System.IO to Docs (#2321)

* Port triple slash comment from System.IO to Docs

* Apply suggestions from code review

Suggestions from rpetrusha

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

Author: carlossanlop

xml/System.IO/FileSystemInfo.xml

@@ -1289,10 +1289,10 @@ On Unix platforms that do not support creation or birth time, this property retu
       </ReturnValue>
       <Parameters />
       <Docs>
-        <summary>To be added.</summary>
-        <returns>To be added.</returns>
+        <summary>Returns the original path. Use the <see cref="P:System.IO.FileSystemInfo.FullName" /> or <see cref="P:System.IO.FileSystemInfo.Name" /> properties for the full path or file/directory name.</summary>
+        <returns>A string with the original path.</returns>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>
   </Members>
-</Type>
+</Type>