Corrected reference from Service → Server in server.xml docs

Author: fatima-qaisar

webapps/docs/config/server.xml

@@ -86,7 +86,7 @@
     </attribute>
 
     <attribute name="utilityThreads" required="false">
-      <p>The number of threads this <strong>Service</strong> will use for
+      <p>The number of threads this <strong>Server</strong> will use for
       various utility tasks, including recurring ones. The special value
       of 0 will result in the value of
       <code>Runtime.getRuntime().availableProcessors()</code> being