Fix namespace in Warning.html for TYPO3 constant

Author: linawolf

Documentation/Global/Be/_Infobox/_Warning.html

@@ -1,6 +1,6 @@
 <f:be.infobox
     title="Message title"
     message="your box content"
-    state="{f:constant(name: 'TYPO3\CMS\Core\Type\ContextualFeedbackSeverity::WARNING')}"
+    state="{f:constant(name: '\TYPO3\CMS\Core\Type\ContextualFeedbackSeverity::WARNING')}"
     disableIcon="true"
 />