[DOC][v1.7.x] Fix pip cu102link

[ChaiBapchya]

Description

Fix the cu102 link on PyPI [https://pypi.org/project/mxnet/]

Checklist

Essentials

• PR's title starts with a category (e.g. [BUGFIX], [MODEL], [TUTORIAL], [FEATURE], [DOC], etc)
• Changes are complete (i.e. I finished coding on this PR)
• All changes have test coverage
• Code is well-documented

[mxnet-bot]

Hey @ChaiBapchya , Thanks for submitting the PR
All tests are already queued to run once. If tests fail, you can trigger one or more tests again with the following commands:

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[ChaiBapchya]

Thanks @NihalHarish for pointing out the issue.

[ChaiBapchya]

@mxnet-label-bot add [pr-awaiting-merge]

[ChaiBapchya]

Not needed to cherry-pick in v1.x as its already in correct state.