comark/sources/missing-link · Link every source

Each item in ::sources is a source a reader can open. An item with no link still gets a number and takes citations, but a reader who follows one finds a title and nowhere to go.

Incorrect

::sources
1. The pond survey from last spring
::

lint-comark example.mdexample.md:1:1 comark/sources/missing-link::sources 1: source 1 has no link.Write it as [Title](https://...).✖ 1 problem

Correct

::sources
1. [The pond survey from last spring](https://example.com/pond-survey)
::

lint-comark example.md✔ No problems