Fix typo in attributes documentation #2085

Job	Run time
Coding Standard	34s
Static analysis	30s
tests (8.0, 5.4.*, lowest, none)	23s
tests (8.0, 5.4.*, highest, none)	37s
tests (8.0, 6.0.*, lowest, none)	27s
tests (8.0, 6.0.*, highest, none)	29s
tests (8.1, 5.4.*, lowest, none)	28s
tests (8.1, 5.4.*, highest, none)	30s
tests (8.1, 6.0.*, lowest, none)	39s
tests (8.1, 6.0.*, highest, none)	29s
tests (8.1, 6.2.*, lowest, none)	28s
tests (8.1, 6.2.*, highest, none)	38s
tests (8.1, 6.4.*, lowest, none)	30s
tests (8.1, 6.4.*, highest, none)	42s
tests (8.2, 5.4.*, lowest, none)	24s
tests (8.2, 5.4.*, highest, none)	30s
tests (8.2, 6.0.*, lowest, none)	22s
tests (8.2, 6.0.*, highest, none)	37s
tests (8.2, 6.2.*, lowest, none)	32s
tests (8.2, 6.2.*, highest, none)	42s
tests (8.2, 6.4.*, lowest, none)	30s
tests (8.2, 6.4.*, highest, none)	35s
tests (8.2, 7.0.*, lowest, none)	29s
tests (8.2, 7.0.*, highest, none)	40s
tests (8.2, 7.1.*, lowest, none)	42s
tests (8.2, 7.1.*, highest, none)	41s
tests (8.3, 5.4.*, lowest, none)	23s
tests (8.3, 5.4.*, highest, none)	37s
tests (8.3, 6.0.*, lowest, none)	21s
tests (8.3, 6.0.*, highest, none)	36s
tests (8.3, 6.2.*, lowest, none)	37s
tests (8.3, 6.2.*, highest, none)	28s
tests (8.3, 6.4.*, lowest, none)	47s
tests (8.3, 6.4.*, highest, none)	38s
tests (8.3, 7.0.*, lowest, none)	29s
tests (8.3, 7.0.*, highest, none)	32s
tests (8.3, 7.1.*, lowest, none)	31s
tests (8.3, 7.1.*, highest, none)	35s
tests (8.0, 5.4.*, lowest, --dev symfony/validator doctrine/orm doctrine/annotations)	55s
tests (8.1, 5.4.*, lowest, pcov)	51s
	22m 28s

Provide feedback