[LICENSE] switch from DISCLAIMER-WIP to DISCLAIMER

[szha]

Description

switch from DISCLAIMER-WIP to DISCLAIMER

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)

Changes

• switch from DISCLAIMER-WIP to DISCLAIMER

Comments

• This change includes the removal of the following mention:

1. The MXNet source code is distributed under the Apache License, Version 2.0. However
building MXNet for GPUs requires compiling with Nvidia tools and libraries
that are not compatible with Apache License, Version 2.0. This will affect the usage for
any binary distributions of MXNet for GPU. 

Based on the fact that GPU functionality is an optional feature in mxnet, we shouldn't have to include this in the disclaimer.

[mxnet-bot]

Hey @szha , 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:

• To trigger all jobs: @mxnet-bot run ci [all]
• To trigger specific jobs: @mxnet-bot run ci [job1, job2]

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CI supported jobs: [windows-gpu, sanity, centos-cpu, windows-cpu, website, clang, unix-gpu, miscellaneous, unix-cpu, edge, centos-gpu]

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Note:
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