comark/sources/second-list · Keep one ::sources per document

A document has one list of sources, and every :cite points into the first. A second ::sources is left empty, so its links never reach the reader, and a citation meant for one of them points past the end of the first list.

Incorrect

Pigeons home by the sun :cite[1].

::sources
1. [Magnetoreception](https://en.wikipedia.org/wiki/Magnetoreception)
::

They may smell their way too.

::sources
1. [Pigeon intelligence](https://en.wikipedia.org/wiki/Pigeon_intelligence)
::

lint-comark example.mdexample.md:9:1 comark/sources/second-list::sources 2: a document has one list of sources, and this is a second.Merge it into the first.✖ 1 problem

Correct

Pigeons home by the sun :cite[1] and by smell :cite[2].

::sources
1. [Magnetoreception](https://en.wikipedia.org/wiki/Magnetoreception)
2. [Pigeon intelligence](https://en.wikipedia.org/wiki/Pigeon_intelligence)
::

lint-comark example.md✔ No problems