Lintian tag information: doc-base-index-references-multiple-files (type: error)

Description (from lintian-explain-tags)

The Index field in a doc-base file should reference the single index file
for that document.

Any other files belonging to the same document should be listed in the
Files field.

Please refer to Format sections (Section 2.3.2.2) in the Debian doc-base
Manual for details.

Visibility: error
Show-Always: no
Check: menus

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