We updated the Internal Resources rules to reflect that sentence case is the new "standard" for titles, table captions, and the like. However, we have yet to implement the standard itself in the guide. Looking at this section as an example:
https://doc-stage.usersys.redhat.com/documentation/en-us/red_hat_jboss_amq/7.1/html-single/amq_7_internal_resources/#headings-titles
The contents of the table uses sentence case, but the section heading and table caption do not.