Lintian tag information: description-synopsis-is-duplicated (type: error)

Description (from lintian-explain-tags)

The first line of the extended Description: should not repeat the synopsis
exactly. This indicates that either the synopsis is badly formed or that
the extended description has been wrongly copied and pasted.

Please refer to The extended description (Section 3.4.2) in the Debian
Policy Manual for details.

Visibility: error
Show-Always: no
Check: fields/description

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