Document System.MemoryExtensions.Overlaps (#3649)

Author: carlossanlop

xml/System/MemoryExtensions.xml

@@ -2821,7 +2821,7 @@ Invalid sequences will be represented in the enumeration by <xref:System.Text.Ru
         <typeparam name="T">The type of elements in the span.</typeparam>
         <param name="span">The first sequence.</param>
         <param name="other">The second sequence.</param>
-        <param name="elementOffset">To be added.</param>
+        <param name="elementOffset">When the method returns, contains the offset between <paramref name="span" /> and <paramref name="other" />.</param>
         <summary>Determines whether two read-only sequences overlap in memory and outputs the element offset.</summary>
         <returns>
           <see langword="true" /> if the two sequences overlap; otherwise, <see langword="false" />.</returns>