[Doc]Doc's little error

[SamX01]

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Description

(Brief description of the problem in no more than 2 sentences.)
The doc description of mxnet.gluon.data.vision.transforms.Cast seems have a little problem.This function is supposed to cast input to a specific data type,but the doc talks about the shape.

Environment info (Required)

What to do:
1. Download the diagnosis script from https://raw.githubusercontent.com/apache/incubator-mxnet/master/tools/diagnose.py
2. Run the script using `python diagnose.py` and paste its output here.

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Minimum reproducible example

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[zachgk]

@mxnet-label-bot add [Python, Gluon, Doc, Pending Requester Info]

Thanks for helping us improve our documentation @SamX01. Can you provide a link to where the problem is? If you are also interested in contributing to this open source project, you can try making the changes yourself and opening a pull request.

[vrakesh]

@SamX01 Are you still facing this issue? if so requesting a link to the the doc problem.