[3.13] gh-125436: Doc: Add missing allow_unnamed_section parameter to ConfigParser documentation (GH-125437)
          #126421
        
          
      
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Add missing
allow_unnamed_sectionparameter toConfigParserdoc, as well as to it's parentRawConfigParser.Split too long line on
ConfigParsersignature.Add some sections about when some of
RawConfigParserparameters were added.(cherry picked from commit d960226)
Co-authored-by: lit [email protected]
allow_unnamed_section=Falseparam #125436📚 Documentation preview 📚: https://cpython-previews--126421.org.readthedocs.build/