change: fix punctuation in warning message

[laurenyu]

Issue #, if available:
https://github.com/aws/sagemaker-python-sdk/pull/1636/files#r446257630

Description of changes:

Testing done:

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[sagemaker-bot]

AWS CodeBuild CI Report

• CodeBuild project: sagemaker-python-sdk-unit-tests
• Commit ID: 52af307
• Result: FAILED
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[sagemaker-bot]

AWS CodeBuild CI Report

• CodeBuild project: sagemaker-python-sdk-notebook-tests
• Commit ID: 52af307
• Result: SUCCEEDED
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[sagemaker-bot]

AWS CodeBuild CI Report

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• Commit ID: 52af307
• Result: SUCCEEDED
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AWS CodeBuild CI Report

• CodeBuild project: sagemaker-python-sdk-local-mode-tests
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[metrizable]

ship it