chore: updating attributeNames type docs

[nicholasgriffintn]

Resolves #451

Description:

Previously, we listed a number of example values for the attributeNames name option, which did not entirely line up with the types that AWS was actually providing through QueueAttributeName.

Type of change:

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Why is this change required?:

To ensure that users aren't confused by the type provided by SQS Consumer.

Code changes:

• Removed the existing examples and replaced them with a link to: https://docs.aws.amazon.com/AWSJavaScriptSDK/v3/latest/Package/-aws-sdk-client-sqs/Variable/QueueAttributeName/

[codeclimate]

Code Climate has analyzed commit 644d5fc and detected 0 issues on this pull request.

The test coverage on the diff in this pull request is 100.0% (80% is the threshold).

This pull request will bring the total coverage in the repository to 98.3% (0.0% change).

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