docs: fix Amazon Bedrock instructions in README

[aaroniscode]

📑 Description

Typo fix for the Amazon Bedrock documentation in README.

✅ Checks

• [X] My pull request adheres to the code style of this project
• [X] My code requires changes to the documentation
• [X] I have updated the documentation as required
• [X] All the tests have passed

ℹ Additional Information

[arbreezy]

@aaroniscode nice catch :pray: