Precompile the image we're referencing, too.

You can't compile a file that references a non-compiled asset's path.

.. unless you turn off asset runtime errors.

Outside of a test case like this, `config.assets.precompile` would
normally retain its default entry, which precompiles all images (and
other non-JS/CSS files) that are in `app/assets`.
Improve readability of contributing to rails guide. [ci skip]
Merge pull request #14852 from matthewd/fix_build_for_assets

Fix railties asset tests: precompile the image we're referencing
Merge pull request #14843 from tgxworld/improve_readability_of_contributing_to_rails_guide

[ci skip] Improve readability of contributing to rails guide.
Fix a typo in the doc of forty_two AR FinderMethod
Merge pull request #14858 from ebouchut/patch-1

Fix a typo in the doc of forty_two AR FinderMethod [ci skip]
[ci skip] Improve formatting and yml
Merge pull request #14856 from Gaurav2728/gaurav-typo_fix

[ci skip] Improve formatting and yml