Add phpdoc for transformation methods into other Collection stubs #160

Job	Run time
Platform test (7.4)	3m 2s
Platform test (8.0)	3m 0s
Platform test (8.1)	3m 10s
Platform test (8.2)	3m 19s
Platform test (8.3)	3m 5s
Platform test (8.4)	3m 11s
Platform test (8.1, doctrine/orm:^3.0 doctrine/dbal:^4.0 carbonphp/carbon-doctrine-types:^3 gedmo...	2m 48s
Platform test (8.2, doctrine/orm:^3.0 doctrine/dbal:^4.0 carbonphp/carbon-doctrine-types:^3 gedmo...	2m 49s
Platform test (8.3, doctrine/orm:^3.0 doctrine/dbal:^4.0 carbonphp/carbon-doctrine-types:^3 gedmo...	2m 39s
Platform test (8.4, doctrine/orm:^3.0 doctrine/dbal:^4.0 carbonphp/carbon-doctrine-types:^3 gedmo...	2m 51s
	29m 54s

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