Lintian tag information: dpatch-missing-description (type: information)

Description (from lintian-explain-tags)

dpatch files should carry a description of the included patch. Description
lines start with "## DP:".

As well as a description of the purpose and function of the patch, the
description should ideally contain author information, a URL for the bug
report (if any), Debian or upstream bugs fixed by it, upstream status, the
Debian version and date the patch was first included, and any other
information that would be useful if someone were investigating the patch
and underlying problem. Please consider using the DEP 3 format for this
information.

Please refer to https://dep-team.pages.debian.net/deps/dep3/ for details.

Visibility: info
Show-Always: no
Check: debian/patches/dpatch

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