In 16.3. About Java Authentication and Authorization Service (JAAS) there is Table with description of jboss-web.xml which contains "Contains JBoss-specific extensions to the web.xml descriptor..", but there should be only one dot at the end of sentence - "Contains JBoss-specific extensions to the web.xml descriptor."
Moving to ON_QA. The changes should be available for review on the documentation stage within an hour or so from this comment. http://documentation-devel.engineering.redhat.com/site/documentation/en-US/JBoss_Enterprise_Application_Platform/
Verified on stage.