Incorrect installation instruction

[eric-haibin-lin]

The instructions for installing mxnet master branch is incorrect.
https://mxnet.apache.org/get_started?version=master&platform=linux&language=python&environ=pip&processor=cpu

It should only show the ones with --pre suffix

@aaronmarkham

[leezu]

How did you arrive at the master version URL? It's not linked from the https://mxnet.apache.org/get_started page

[eric-haibin-lin]

There is a drop-down list for "MXNet version", and i selected "Master"

[leezu]

Thanks. I didn't realize that this dropdown list exists. There seems to be no UI element indicating the existence of the dropdown prior to hovering over the version number.

[aaronmarkham]

The content looks fine in here: https://github.com/apache/incubator-mxnet/blame/master/docs/static_site/src/_includes/get_started/linux/python/cpu/pip.md

This is probably some javascript bug in here: https://github.com/apache/incubator-mxnet/blob/master/docs/static_site/src/assets/js/options.js
Never been a fan of these conditional selectors... seems like they're always breaking.

[eric-haibin-lin]

@aaronmarkham what's the alternative solution you're proposing?

[aaronmarkham]

@aaronmarkham what's the alternative solution you're proposing?

Maybe mxnet-oncall can spend time looking at the js function that runs that feature.
I looked it over and nothing pops out as why it isn't working. Happy to work with someone on it that maybe knows more js and how to use the debugger to experiment with the div states.

[ys2843]

@aaronmarkham @eric-haibin-lin Above PR fixed this issue, preview link attached, please feel free to verify.