[Misc] Improved javadoc

...rc/main/java/org/xwiki/mail/script/ScriptMimeMessage.java

...r/xwiki-platform-distribution-docker-tomcat-mysql/pom.xml

...stribution-docker-tomcat-mysql/src/main/docker/Dockerfile

...ribution-docker-tomcat-mysql/src/main/docker/assembly.xml

...ution-docker-tomcat-mysql/src/main/docker/mysql/xwiki.cnf

...tion-docker-tomcat-mysql/src/main/docker/tomcat/setenv.sh

...r-tomcat-mysql/src/main/docker/xwiki/docker-entrypoint.sh

...cker-tomcat-mysql/src/main/docker/xwiki/hibernate.cfg.xml