Improve docstring for code-generated Config object

[jonathan343]

Summary

This PR improves the docstring for code-generated Config objects for AWS service clients.

We currently use the name of the smithy service type and will instead try to use the sdkId.

Examples

Bedrock Runtime

Before:

class Config:
    """Configuration for AmazonBedrockFrontendService."""

After:

class Config:
    """Configuration for Bedrock Runtime."""

Transcribe Streaming

Before:

class Config:
    """Configuration for Transcribe."""

After:

class Config:
    """Configuration for Transcribe Streaming."""

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