fix return value formatting (#4093)

Author: mairaw

xml/System/Int32.xml

@@ -1193,9 +1193,9 @@
         <returns>A signed number indicating the relative values of this instance and <paramref name="value" />.
           <list type="table"><listheader><term>Return Value</term><description>Description</description></listheader><item><term>Less than zero</term><description>This instance is less than <paramref name="value" />.</description></item><item><term>Zero</term><description>This instance is equal to <paramref name="value" />.</description></item><item><term>Greater than zero</term><description>This instance is greater than <paramref name="value" />.
 
-                -or-
+-or-
 
-                <paramref name="value" /> is <see langword="null" />.</description></item></list></returns>
+<paramref name="value" /> is <see langword="null" />.</description></item></list></returns>
         <remarks>
           <format type="text/markdown"><![CDATA[