documentation: Update link to Sagemaker PyTorch Docker Containers

[NickHilton]

Issue #, if available:
N/A

Description of changes:

• Link to redirect to the Sagemaker PyTorch Docker Containers was broken, and then redirecting to the wrong place (just the main Sagemaker PyTorch section here)
• New link goes to the correct place where the docker containers are here

Testing done:

• Link goes to the right place

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[sagemaker-bot]

AWS CodeBuild CI Report

• CodeBuild project: sagemaker-python-sdk-notebook-tests
• Commit ID: 6b573a4
• Result: SUCCEEDED
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[sagemaker-bot]

AWS CodeBuild CI Report

• CodeBuild project: sagemaker-python-sdk-local-mode-tests
• Commit ID: 6b573a4
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AWS CodeBuild CI Report

• CodeBuild project: sagemaker-python-sdk-pr
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[sagemaker-bot]

AWS CodeBuild CI Report

• CodeBuild project: sagemaker-python-sdk-unit-tests
• Commit ID: 6b573a4
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AWS CodeBuild CI Report

• CodeBuild project: sagemaker-python-sdk-notebook-tests
• Commit ID: 53b7a5a
• Result: SUCCEEDED
• Build Logs (available for 30 days)

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[sagemaker-bot]

AWS CodeBuild CI Report

• CodeBuild project: sagemaker-python-sdk-local-mode-tests
• Commit ID: 53b7a5a
• Result: SUCCEEDED
• Build Logs (available for 30 days)

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[sagemaker-bot]

AWS CodeBuild CI Report

• CodeBuild project: sagemaker-python-sdk-pr
• Commit ID: 53b7a5a
• 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: 53b7a5a
• Result: SUCCEEDED
• Build Logs (available for 30 days)

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