Remove references to archived FisherYates from the SwiftPM docs

[cmcgee1024]

Motivation:

The SwiftPM documentation has a reference to an example project that is archived, which makes it more difficult to follow the basic usage.

Modifications:

Modified the SwiftPM basic usage documentation to remove the references to the archived project, and better align with the other examples.

Result:

The documentation for SwiftPM will be updated to remove the non-existent example.

[0xTim]

@swift-ci please test