Add phpdoc for transformation methods into other Collection stubs #161

Job	Run time
Platform test (7.4)	3m 34s
Platform test (8.0)	3m 9s
Platform test (8.1)	3m 2s
Platform test (8.2)	3m 28s
Platform test (8.3)	3m 12s
Platform test (8.4)	3m 21s
Platform test (8.1, doctrine/orm:^3.0 doctrine/dbal:^4.0 carbonphp/carbon-doctrine-types:^3 gedmo...	2m 55s
Platform test (8.2, doctrine/orm:^3.0 doctrine/dbal:^4.0 carbonphp/carbon-doctrine-types:^3 gedmo...	3m 10s
Platform test (8.3, doctrine/orm:^3.0 doctrine/dbal:^4.0 carbonphp/carbon-doctrine-types:^3 gedmo...	2m 44s
Platform test (8.4, doctrine/orm:^3.0 doctrine/dbal:^4.0 carbonphp/carbon-doctrine-types:^3 gedmo...	2m 57s
	31m 32s

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