add samples for pathExpectations of api-fluent

[robstoll]

Code related feature

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

Following the things you need to do:

api-fluent

• add one function per function in pathExpectations.kt and non deprectated function in pathAssertions to PathExpectationSamples (see PathExpectationSamples)
• 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 pathExpectations and pathAssertions via @sample (check out toEqual in anyExpectations.kt to see how you have to refer to the sample)

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[kacmacuna]

I'll work on this