Update Collection`1.xml (#5021)

Correct wrong type of collection being searched by IndexOf

Author: NetMage

xml/System.Collections.ObjectModel/Collection`1.xml

@@ -788,7 +788,7 @@
         <Parameter Name="item" Type="T" />
       </Parameters>
       <Docs>
-        <param name="item">The object to locate in the <see cref="T:System.Collections.Generic.List`1" />. The value can be <see langword="null" /> for reference types.</param>
+        <param name="item">The object to locate in the <see cref="T:System.Collections.ObjectModel.Collection`1" />. The value can be <see langword="null" /> for reference types.</param>
         <summary>Searches for the specified object and returns the zero-based index of the first occurrence within the entire <see cref="T:System.Collections.ObjectModel.Collection`1" />.</summary>
         <returns>The zero-based index of the first occurrence of <paramref name="item" /> within the entire <see cref="T:System.Collections.ObjectModel.Collection`1" />, if found; otherwise, -1.</returns>
         <remarks>