docs: use "Amazon Bedrock" in bidirectional-streaming samples

[avneetbansal-aws]

Amazon Bedrock AgentCore Samples Pull Request

Issue number: #186

Concise description of the PR

The bidirectional-streaming samples under 01-features/02-host-your-agent/01-runtime/03-advanced/03-bidirectional-streaming still call the service "AWS Bedrock" in a few places. The correct name is Amazon Bedrock. This updates the prose references so the samples match the service name, which is what #186 is tracking.

The change touches a README line, a docstring, and some client.py help text and comments across the sonic, strands, and langchain streaming samples. It is wording only. The aws bedrock CLI commands and the arn:aws:bedrock... resource names are left untouched, since those are literal identifiers and changing them would break copy-paste.

User experience

Before, a reader of these samples sees "AWS Bedrock" in the docs and comments, which does not match the product name used everywhere else in the repo and in the AWS docs. After, the wording reads "Amazon Bedrock" consistently, with no change to any runnable command or ARN.

Checklist

If your change doesn't seem to apply, please leave them unchecked.

• I have reviewed the contributing guidelines
• Add your name to CONTRIBUTORS.md
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?
• Are you uploading a dataset?
• Have you documented Introduction, Architecture Diagram, Prerequisites, Usage, Sample Prompts, and Clean Up steps in your example README?
• I agree to resolve any issues created for this example in the future.
• I have performed a self-review of this change
• Changes have been tested
• Changes are documented

Acknowledgment

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