documentation: fix conda setup for docs

[aaronmarkham]

Description of changes:
The website setup instructions for conda didn't work because the theme package uses underscores in conda instead of dashes like on pip. 🤷

Testing done:
Built the docs.

General

• I have read the CONTRIBUTING doc
• I used the commit message format described in CONTRIBUTING
• I have passed the region in to all S3 and STS clients that I've initialized as part of this change.
• I have updated any necessary documentation, including READMEs and API docs (if appropriate)

Tests

• I have added tests that prove my fix is effective or that my feature works (if appropriate)
• I have checked that my tests are not configured for a specific region or account (if appropriate)
• I have used unique_name_from_base to create resource names in integ tests (if appropriate)

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[sagemaker-bot]

AWS CodeBuild CI Report

• CodeBuild project: sagemaker-python-sdk-local-mode-tests
• Commit ID: a8e858f
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AWS CodeBuild CI Report

• CodeBuild project: sagemaker-python-sdk-notebook-tests
• Commit ID: a8e858f
• Result: SUCCEEDED
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AWS CodeBuild CI Report

• CodeBuild project: sagemaker-python-sdk-pr
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• CodeBuild project: sagemaker-python-sdk-unit-tests
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• CodeBuild project: sagemaker-python-sdk-notebook-tests
• Commit ID: 52565f7
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• CodeBuild project: sagemaker-python-sdk-unit-tests
• Commit ID: 52565f7
• Result: FAILED
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• CodeBuild project: sagemaker-python-sdk-local-mode-tests
• Commit ID: 52565f7
• Result: SUCCEEDED
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AWS CodeBuild CI Report

• CodeBuild project: sagemaker-python-sdk-pr
• Commit ID: 52565f7
• Result: SUCCEEDED
• Build Logs (available for 30 days)

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AWS CodeBuild CI Report

• CodeBuild project: sagemaker-python-sdk-unit-tests
• Commit ID: 52565f7
• Result: SUCCEEDED
• Build Logs (available for 30 days)

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[icywang86rui]

black-check failed. It's strange. I did just update the branch but whatever change i merged in should have already passed the black-check.