Modify Javadoc generation command in workflow

Updated Maven command to include the -am flag for Javadoc generation.

Author: thomasturrell

.github/workflows/maven-publish-snapshot.yml

@@ -29,4 +29,4 @@ jobs:
           MAVEN_USERNAME: ${{ secrets.OSSRH_USERNAME }}
           MAVEN_PASSWORD: ${{ secrets.OSSRH_TOKEN }}
       - name: Generate Javadoc
-        run: mvn -B javadoc:javadoc --file pom.xml -pl xapi-build,xapi-model,xapi-client,xapi-model-spring-boot-starter # This checks that the Javadoc is valid
+        run: mvn -B javadoc:javadoc --file pom.xml -pl xapi-model,xapi-client,xapi-model-spring-boot-starter -am # This checks that the Javadoc is valid