Lintian tag information: syntax-error-in-debian-changelog (type: warning)

Description (from lintian-explain-tags)

While parsing the Debian changelog, a syntax error was found. If you have
old changelog entries that don't follow the current syntax but that you
want to keep as-is for the historical record, add the line:

Old Changelog:

with no leading whitespace before the legacy entries. This line and
everything after it will be ignored.

Please refer to Debian changelog: debian/changelog (Section 4.4) in the
Debian Policy Manual for details.

Visibility: warning
Show-Always: no
Check: debian/changelog

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