Add phpdoc for transformation methods into other Collection stubs #159

Job	Run time
Platform test (7.4)	3m 7s
Platform test (8.0)	2m 52s
Platform test (8.1)	3m 4s
Platform test (8.2)	3m 7s
Platform test (8.3)	2m 56s
Platform test (8.4)	3m 20s
Platform test (8.1, doctrine/orm:^3.0 doctrine/dbal:^4.0 carbonphp/carbon-doctrine-types:^3 gedmo...	2m 39s
Platform test (8.2, doctrine/orm:^3.0 doctrine/dbal:^4.0 carbonphp/carbon-doctrine-types:^3 gedmo...	2m 54s
Platform test (8.3, doctrine/orm:^3.0 doctrine/dbal:^4.0 carbonphp/carbon-doctrine-types:^3 gedmo...	2m 59s
Platform test (8.4, doctrine/orm:^3.0 doctrine/dbal:^4.0 carbonphp/carbon-doctrine-types:^3 gedmo...	2m 45s
	29m 43s

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