Migration Module code example isn't rendering on hexdocs - 2.0

[fozcodes]

Steps to reproduce

https://hexdocs.pm/distillery/guides/running_migrations.html#migration-module

The code block for the Migration Module isn't rendering on hexdocs.

Description of issue

• What are the expected results?
  • Should see the code for the module as you do in the Markdown file: https://github.com/bitwalker/distillery/blob/master/docs/guides/running_migrations.md#migration-module
• What version of Distillery?
  • 2.x

[fozcodes]

I would make a PR, but I'm not sure how these are generated with this new style for hexdocs.

[chenxsan]

There's already a pull request here https://github.com/bitwalker/distillery/pull/595 :)

[fozcodes]

Ah, nice @chenxsan! Thanks!