Restore missing summary line

Author: Robo210

xml/System.Diagnostics/EventLog.xml

@@ -2562,7 +2562,8 @@ SVC_UPDATE.EXE
       </Parameters>
       <Docs>
         <param name="action">The overflow behavior for writing new entries to the event log. Must not be `OverwriteOlder`.</param>
-        <param name="retentionDays">Deprecated. Must be 0.</summary>
+        <param name="retentionDays">Deprecated. Must be 0.</param>
+        <summary>Changes the configured behavior for writing new entries when the event log reaches its maximum file size.</summary>
         <remarks>
           <format type="text/markdown"><![CDATA[