docs(license): update license for the webex-js-sdk

[sreenara]

COMPLETES # ZD:122275

This pull request addresses

clarifications required in the licensing of the Webex JS SDK for contribution from external developers and wider community.

by making the following changes

Update the LICENSE.md file with the required changes.

Change Type

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [x] Documentation update
• [ ] Tooling change
• [ ] Internal code refactor

The following scenarios where tested

< ENUMERATE TESTS PERFORMED, WHETHER MANUAL OR AUTOMATED >

I certified that

• [ ] I have read and followed contributing guidelines

• [ ] I discussed changes with code owners prior to submitting this pull request

• [ ] I have not skipped any automated checks

• [ ] All existing and new tests passed

• [ ] I have updated the documentation accordingly

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Make sure to have followed the contributing guidelines before submitting.

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