CONTRIBUTING.md: small text refinement #700

Job	Run time
PHPUnit Composer v2 (PHP 7.4)	41s
PHPUnit (PHP 7.2)	40s
PHPUnit coverage (PHP 7.4)	1m 2s
PHPUnit (PHP 7.3)	42s
Tests alternative autoloader (PHP 7.1)	7s
PHPUnit (PHP 7.1)	36s
PHPUnit (PHP 7.4)	36s
Tests alternative autoloader (PHP 7.2)	11s
PHPUnit (PHP 8.0)	47s
PHPUnit lowest deps (PHP 7.3)	31s
Tests alternative autoloader (PHP 7.3)	8s
PHPUnit (PHP 8.1)	41s
Tests alternative autoloader (PHP 7.4)	6s
Windows-Tests with PHP 7.1	1m 12s
PHPUnit (PHP 8.2)	33s
Tests alternative autoloader (PHP 8.0)	6s
Windows-Tests with PHP 7.2	1m 2s
PHPUnit (PHP 8.3)	29s
Tests alternative autoloader (PHP 8.1)	6s
Windows-Tests with PHP 7.3	57s
PHPUnit (PHP 8.4)	31s
Tests alternative autoloader (PHP 8.2)	8s
Windows-Tests with PHP 7.4	57s
Tests alternative autoloader (PHP 8.3)	8s
Windows-Tests with PHP 8.0	1m 0s
Tests alternative autoloader (PHP 8.4)	10s
Windows-Tests with PHP 8.1	59s
Windows-Tests with PHP 8.2	59s
Windows-Tests with PHP 8.3	1m 2s
Windows-Tests with PHP 8.4	53s
	18m 0s

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