Glossary: "method" - improve formatting

[wjandrea]

• Move up "function" link
• Add links to "class" and "attribute"
• Use consistent "See also"

From:

method

A function which is defined inside a class body. If called as an attribute of an instance of that class, the method will get the instance object as its first argument (which is usually called self). See function and nested scope.

To:

method

A function which is defined inside a class body. If called as an attribute of an instance of that class, the method will get the instance object as its first argument (which is usually called self).

See also nested scope.

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• specifically https://cpython-previews--144714.org.readthedocs.build/en/144714/glossary.html#term-method