Fix incorrect xref in StructuralComparisons.xml (#9832)

The remarks for `StructuralComparisons.StructuralEqualityComparer` incorrectly state the property returns an `IComparer` object, when it actually returns an `IEqualityComparer`.

Author: youngspe

xml/System.Collections/StructuralComparisons.xml

@@ -163,7 +163,7 @@
           <format type="text/markdown"><![CDATA[  
   
 ## Remarks  
- When the <xref:System.Collections.IComparer> object returned by this property is passed to the equality comparison method of a collection object, such as <xref:System.Array.System%23Collections%23IStructuralEquatable%23Equals%28System.Object%2CSystem.Collections.IEqualityComparer%29?displayProperty=nameWithType> or <xref:System.Tuple%603.System%23Collections%23IStructuralEquatable%23Equals%28System.Object%2CSystem.Collections.IEqualityComparer%29?displayProperty=nameWithType>, its <xref:System.Collections.IEqualityComparer.Equals%2A?displayProperty=nameWithType> method is called for each member of an array or for each component of a tuple. This implementation of the <xref:System.Collections.IEqualityComparer.Equals%2A> method behaves as follows when it compares each item of a collection object with the corresponding item of another collection object:  
+ When the <xref:System.Collections.IEqualityComparer> object returned by this property is passed to the equality comparison method of a collection object, such as <xref:System.Array.System%23Collections%23IStructuralEquatable%23Equals%28System.Object%2CSystem.Collections.IEqualityComparer%29?displayProperty=nameWithType> or <xref:System.Tuple%603.System%23Collections%23IStructuralEquatable%23Equals%28System.Object%2CSystem.Collections.IEqualityComparer%29?displayProperty=nameWithType>, its <xref:System.Collections.IEqualityComparer.Equals%2A?displayProperty=nameWithType> method is called for each member of an array or for each component of a tuple. This implementation of the <xref:System.Collections.IEqualityComparer.Equals%2A> method behaves as follows when it compares each item of a collection object with the corresponding item of another collection object:  
   
 -   If both items are `null`, it considers the two items to be equal.