Remove log4j-docgen processor

Author: ppkarwasz

log4j-core/pom.xml

@@ -112,11 +112,6 @@
               <artifactId>log4j-plugin-processor</artifactId>
               <version>${project.version}</version>
             </path>
-            <path>
-              <groupId>org.apache.logging.log4j</groupId>
-              <artifactId>log4j-docgen</artifactId>
-              <version>0.8.0-SNAPSHOT</version>
-            </path>
           </annotationProcessorPaths>
         </configuration>
       </plugin>