refactor(javadoc): remove JavaDoc

* read the code instead :)

src/main/java/io/zeebe/http/ConfigurationMaps.java

@@ -5,18 +5,6 @@
 import java.util.Map;
 import java.util.Optional;
 
-/**
- * Map that overlays different sources for objects used in expressions, namely
- * 
- *   <li>Custom Headers of a Task in a BPMN workflow</li>
- *   <li>Workflow variables of the current instance</li>
- *   <li>Environment variables loaded from a given URL</li>
- *
- * Additionally some constants can also be resolved, namely
- * 
- *  <li>jobKey</li>
- *  <li>processInstanceKey</li>
- */
 public class ConfigurationMaps {
 
   private final Map<String, String> customHeaders;