Fix PHPdoc return tags and a code warning #236

Job	Run time
Linter / json-linter	30s
PHP-Linter (8.1) / linter	13s
PHP-Linter (8.4) / linter	13s
PHP-Linter (8.3) / linter	13s
PHP-Linter (8.2) / linter	13s
Linter / yaml-linter	5s
Linter / style-linter	0s
Linter / ecmascript-linter	0s
Unit tests, PHP 8.2, ubuntu-latest	24s
Unit tests, PHP 8.1, ubuntu-latest	24s
Unit tests, PHP 8.1, windows-latest	47s
Unit tests, PHP 8.3, ubuntu-latest	22s
Unit tests, PHP 8.3, windows-latest	46s
Unit tests, PHP 8.2, windows-latest	50s
Unit tests, PHP 8.4, windows-latest	42s
Unit tests, PHP 8.4, ubuntu-latest	18s
Security checks	-1s
Code coverage	-1s
Cleanup artifacts	-1s
Quality control	-1s
	5m 56s

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