Fix log4j artifact id in docs

Author: felixbarny

log4j-ecs-layout/README.md

@@ -8,11 +8,11 @@ Add a dependency to your application
 ```xml
 <dependency>
     <groupId>co.elastic.logging</groupId>
-    <artifactId>log4j2-ecs-layout</artifactId>
+    <artifactId>log4j-ecs-layout</artifactId>
     <version>${ecs-logging-java.version}</version>
 </dependency>
 ```
 
 If you are not using a dependency management tool, like maven, you have to add both,
-`log4j2-ecs-layout` and `ecs-logging-core` jars manually to the classpath.
-For example to the `$CATALINA_HOME/lib` directory.
+`log4j-ecs-layout` and `ecs-logging-core` jars manually to the classpath.
+For example to the `$CATALINA_HOME/lib` directory.