minor: fix description at plugin description, it should be plain text

Author: romani

checkstyle-sonar-plugin/pom.xml

@@ -351,7 +351,7 @@
           <pluginKey>checkstyle</pluginKey>
           <pluginName>Checkstyle</pluginName>
           <pluginClass>org.sonar.plugins.checkstyle.CheckstylePlugin</pluginClass>
-          <pluginDescription><![CDATA[Analyze Java code with <a href="http://checkstyle.sourceforge.net/">Checkstyle</a>.]]></pluginDescription>
+          <pluginDescription>Analyze Java code with Checkstyle</pluginDescription>
           <archive>
             <manifestEntries>
               <!-- ${buildNumber} is the svn revision generated by the buildnumber-maven-plugin -->