Fix formatting (#3786)

Author: Youssef1313

xml/System.Collections/IComparer.xml

@@ -102,9 +102,7 @@ The following example uses the <xref:System.Collections.IComparer> interface to
         <param name="x">The first object to compare.</param>
         <param name="y">The second object to compare.</param>
         <summary>Compares two objects and returns a value indicating whether one is less than, equal to, or greater than the other.</summary>
-        <returns>A signed integer that indicates the relative values of <paramref name="x" /> and <paramref name="y" />:<br />   - If less than 0, <paramref name="x" /> is less than <paramref name="y" />.<br />   - If 0, <paramref name="x" /> equals <paramref name="y" />.<br />   - If greater than 0, <paramref name="x" /> is greater than <paramref name="y" />. 
-  
-      .</returns>
+        <returns>A signed integer that indicates the relative values of <paramref name="x" /> and <paramref name="y" />:<br />   - If less than 0, <paramref name="x" /> is less than <paramref name="y" />.<br />   - If 0, <paramref name="x" /> equals <paramref name="y" />.<br />   - If greater than 0, <paramref name="x" /> is greater than <paramref name="y" />.</returns>
         <remarks>
           <format type="text/markdown"><![CDATA[