[issue38872] Document exec symbol for codeop.compile_command

[Matthias Bussonnier]

Matthias Bussonnier <bussonniermatthias at gmail.com> added the comment:

See the `compile()` documentation for the difference between eval/single/exec:

https://docs.python.org/3/library/functions.html#compile

`exec` is meant for multiline program, for example you would "exec" the string read from a file to get a module. 

I don't think we should re-document what each of these does, but list the possible values that compile_command/CommandCompiler() can take.

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