Fix configuration of maven-javadoc-plugin

Since maven-javadoc-plugin additionalJOption replaces additionalparam to
pass additional options to JavaDoc.

See https://maven.apache.org/plugins/maven-javadoc-plugin/javadoc-mojo.html#additionalJOption

Change-Id: Iddff5873520a181bcb9edf285b0c8db532e930ee
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

pom.xml

@@ -524,7 +524,7 @@
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-javadoc-plugin</artifactId>
         <configuration>
-          <additionalparam>-Xdoclint:-missing</additionalparam>
+          <additionalJOption>-Xdoclint:-missing</additionalJOption>
           <encoding>${project.build.sourceEncoding}</encoding>
           <quiet>true</quiet>
           <excludePackageNames>org.eclipse.jgit.http.test</excludePackageNames>