All reports of doc-base-abstract-might-contain-extra-leading-whitespace for the archive. The extended description of this tag is:
Continuation lines of the Abstract field of doc-base control file should start with only one space unless they are meant to be displayed verbatim by frontends.
Refer to Debian doc-base Manual section 2.3.2 (Syntax of the control file) for details.
This tag has not been emitted in any package tested by Lintian.