Data Iterators documentation is broken

[anirudhacharya]

Many of the API references are not working - http://mxnet.incubator.apache.org/api/python/io/io.html#data-iterators

[anirudhacharya]

@mxnet-label-bot [Doc, Data-loading]

@aaronmarkham please check

[aaronmarkham]

It seems like importing in the Python module is misconfigured. Refer to #12829
and
#12318 -- seems closer to the issue found here.

[aaronmarkham]

So Sphinx is getting confused. See this related issue: sphinx-doc/sphinx#4961
It looks like to process to fix this is to be very specific about what method is being referenced. I'm working on a solution for this page, but it looks like this is a problem throughout the docs.

[aaronmarkham]

This is ending up being a fairly big issue. The changes since v1.3.0 have caused many of the docs to disappear or point to the wrong methods when methods have the same name.
Sphinx isn't seeing what's there. The autosummary / autodoc features would just walk through the APIs and list things out.