The tag is present in Lintian version 2.104.244. That is the most recent version we know about.
The section indicated in this doc-base control file has a top-level
section of Apps or Applications. This section is only used in menu, not
in doc-base. Simply removing the
Applications/ part of the
section will lead to a valid doc-base section.
Refer to Debian doc-base Manual section 2.3.3 for details.