[docs] Signature of configparser.ConfigParser

[Sven Heinemann]

I just tried to set up a ConfigParser by giving all settings as 
positional arguments. According to the documentation, this should be 
possible. However, I got the error message, that ConfigParser.__init__() 
only accepts up to four positional arguments, effectively three, since 
the first one is `self`. I had to inspect its constructor to find out 
what's really going on. It should be documented.

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