Clarify `acceptable_conclusions` format #242

Job	Run time
pre-commit	32s
pylint-safety	26s
Reset test branches	4s
Testing - non-protected	0s
Testing - protected	0s
Testing - protected (--force)	0s
Testing - Setting `branch` and `ref` fails	0s
Testing - Fail for non-existant branch	0s
Testing - Using `path`	0s
Testing - Default for `acceptable_conclusions` with skipped checks	0s
Testing - Using `fail_fast`	0s
	1m 2s

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