Change ArrayObject offsetGet php-doc #1958

Job	Run time
Run cs-fixer and stubs structure tests	2m 53s
Run tests against php 5.6	11m 19s
Run tests against php 7.0	11m 55s
Run tests against php 7.1	12m 17s
Run tests against php 7.2	12m 32s
Run tests against php 7.3	13m 24s
Run tests against php 7.4	14m 1s
Run tests against php 8.0	15m 29s
Run tests against php 8.1	15m 13s
Run tests against php 8.2	15m 22s
Run tests against php 8.3	14m 58s
	2h 19m 23s

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