samples for Iterable.toContain.exactly

[robstoll]

Code related feature

Following the things you need to do:

api-infix

• add a exactly method in IterableLikeToContainCheckerSamples (see CharSequenceToContainCheckerSamples
• link in the KDoc of the corresponding function in iterableLikeToContainCheckers.kt to the sample via @sample (see charsequenceToContainCheckers.kt)

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[Nikos-Tsiougranas]

Hello @robstoll, I will work on this