Part of meta-issue #1518116: [meta] Make Core pass Coder Review
Postponed because of #1326664: Clean up API docs for system module (excluding subdirectories)
Updating for #1299424: Allow one module per directory and move system tests to core/modules/system
As part of #1800046: [META] Add missing type hinting to core docblocks, I created a sub-issue #1800330: Add missing type hinting to System module docblocks to address the addition of missing type hinting to the System module.
See #1518116-86: [meta] Make Core pass Coder Review. This issue is postponed until the meta issue is either closed or reopened.
Closing in favor of #2571965: [meta] Fix coding standards in core. In this issue the coding standards will be fixed on a sniff-per-sniff basis rather than a module-per-module basis.
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