Bug in documentation for extended attributes

[tabatkins]

From the README:

A list of extended attributes, or None. Extended attributes are stored as Constructs, those of the forms: 'identifier', 'identifier=identifier', 'identifier(ArgumentList)', 'identifier=identifier(ArgumentList)', or 'identifier(Type,Type)' are parsed. The first identifier is stored in 'Construct.attribute', the second, if present, is stored in 'Construct.name', arguments are stored in 'Construct.arguments'. Extended attributes not mathing those five forms contain a list of tokens in 'Construct.tokens' and their name is set to 'None'.

I interpreted this as saying that, if encountering [Exposed=Window], the string "Exposed" would be in .attribute, while "Window" would be in .name. I'm not sure how else to read it, actually.

This is wrong, tho - .name contains "Exposed", .attribute appears to contain the attribute itself again, and I don't know where "Window" is stored at all. (Maybe .arguments? I haven't checked yet.)

(I'm trying to resolve #27 and speced/bikeshed#1077 right now.)