[issue17902] Document that _elementtree C API cannot use custom TreeBuilder for iterparse or IncrementalParser

[Eli Bendersky]

Eli Bendersky added the comment:

Aaron, could you please sign the PSF CLA (http://www.python.org/psf/contrib/contrib-form/) - this will make it accepting patches from you easier.

Other than that, I agree it's a legit patch. The alternative would be to fix _elementtree to actually allow arbitrary TreeBuilders there, although I'm not sure it's worth the effort.

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