[TASK] Polish the "git commits" section of `CONTRIBUTING.md` (#1380) #2328

Job	Run time
Composer Validate (8.3)	12s
PHP Lint (7.3)	8s
PHP Lint (7.4)	8s
PHP Lint (8.0)	8s
PHP Lint (8.1)	9s
PHP Lint (8.2)	8s
PHP Lint (8.3)	8s
PHP Lint (8.4)	7s
Static Analysis (composer:normalize, 8.3)	22s
Unit tests (7.3, lowest)	12s
Static Analysis (php:fixer, 8.3)	31s
Unit tests (7.3, highest)	19s
Static Analysis (php:md, 8.3)	34s
Unit tests (7.4, lowest)	15s
Static Analysis (php:rector, 8.3)	33s
Unit tests (7.4, highest)	11s
Static Analysis (php:stan, 8.3)	37s
Unit tests (8.0, lowest)	12s
Unit tests (8.0, highest)	18s
Unit tests (8.1, lowest)	13s
Unit tests (8.1, highest)	13s
Unit tests (8.2, lowest)	12s
Unit tests (8.2, highest)	19s
Unit tests (8.3, lowest)	12s
Unit tests (8.3, highest)	19s
Unit tests (8.4, lowest)	13s
Unit tests (8.4, highest)	16s
	7m 9s

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