fix(jmx): corrected date format

Author: yamahito

src/main/xar-resources/data/jmx/jmx.xml

@@ -5,7 +5,7 @@
     xmlns:xlink="http://www.w3.org/1999/xlink">
     <info>
         <title>Java Management Extensions (JMX)</title>
-        <date>February 2022</date>
+        <date>2022-02</date>
         <keywordset>
             <keyword>java-development</keyword>
             <keyword>operations</keyword>