Code related feature

With this issue we want to add samples for optionalExpectations.kt of api-fluent

Following the things you need to do:

api-fluent

• create OptionalExpectationSamples in apis/fluent-en_GB/atrium-api-fluent-en_GB-jvm/src/test/kotlin/ch/tutteli/atrium/api/fluent/en_GB/samples
• add one function per function in optionalExpectations.kt (see ListExpectationSamples)
  • for functions having two overloads where one expects an assertionCreator in addition -- add the suffix Feature to the function name of the one not expecting assertionCreator (see ListExpectationSamples)
• refer to the sample in the KDoc of the corresponding function in optionalExpectations.kt via @sample (check out toEqual in anyExpectations.kt to see how you have to refer to the sample)

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