Extends documentation about commands' phpdoc possibilities/limitations

Describe your use case and the problem you are facing

Commands cookbook is lacking some edge-cases about commands' options and I didn't find my answer in any other place either.

Describe the solution you'd like

I'd like to find answers to the following topics regarding phpdoc definition of a command:

Handling short option. Why aren't they supported? Is there known workarounds?
Handling options expecting a comma-separated list of values (like in --foo=bar,baz). It's another common case and I failed to find any example. It's sad options couldn't be used and one can't know if some utils already exist within wp-cli to handle them.
Multiple occurrences of the same option (like in --regex=ab --regex=cd) is another case where documentation is lacking.

Short options will be supported by wp-cli/wp-cli#6176 if we decide to add it.

2 and 3 are covered by wp-cli/wp-cli#6198

wp-cli/wp-cli#6145 is another good addition for the documentation

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