documentation: fix package name in pip install command

[obrep]

The package exists under the name 'sagemaker-inference'. This change fixes the name for the pip install command from nonexistant 'sagemaker-inference-toolkit'

Issue #, if available: None

Description of changes: Changed the name of package to 'sagemaker-inference' in the pip install command in README.md

Testing done: None, documentation change

Merge Checklist

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General

• [x] I have read the CONTRIBUTING doc
• [x] I used the commit message format described in CONTRIBUTING
• [ ] I have used the regional endpoint when creating S3 and/or STS clients (if appropriate)
• [x] I have updated any necessary documentation, including READMEs

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)

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-inference-toolkit-pr
• Commit ID: d1dc518723000fb9d6c10c41de28b05d1f971e0e
• Result: SUCCEEDED
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[laurenyu]

thanks for the contribution!