xcap_server: docs - removed trailing spaces

src/modules/xcap_server/doc/xcap_server.xml

@@ -30,8 +30,8 @@
 	</copyright>
     </bookinfo>
     <toc></toc>
-    
+
     <xi:include href="xcap_server_admin.xml"/>
-    
-    
+
+
 </book>