Add code examples for copy/paste using PlatformOutput::commands and OutputCommand

[Lekyaira]

Is your feature request related to a problem? Please describe.

Code documentation and examples directory doesn't have any examples on how to use this feature. Unlike the depreciated PlatformOutput::copied_text, it is not obvious (to me at least) how to use this.

Describe the solution you'd like

Add code examples to Docs.rs and an example in the examples directory.

Describe alternatives you've considered

Google search. Didn't help.

Additional context

None