docs: add type information for client config to Command examples

[aBurmeseDev]

Issue #, if available:

• (API Reference Docs) Client Config in code examples lacks reference aws/aws-sdk-js-v3#6858

Previously asked by users:

• (short issue description) aws/aws-sdk-js-v3#6083
• what to put as a config? aws/aws-sdk-js-v3#6097
• config is missing and const makes the example hard to use aws/aws-sdk-js-v3#6624
• Example is missing a value for the key variable 'config' aws/aws-sdk-js-v3#6854
• (short issue description) aws/aws-sdk-js-v3#6070
• config is not defined aws/aws-sdk-js-v3#5944
• Where are we filling config object aws/aws-sdk-js-v3#5603
• Documentation Not Complete aws/aws-sdk-js-v3#5417
• config is not defined aws/aws-sdk-js-v3#5326
• client config object documentation aws/aws-sdk-js-v3#5260
• What is the value of the config?  aws/aws-sdk-js-v3#5019
• Lack of examples aws/aws-sdk-js-v3#4452

Description of changes:

Fixing it by adding explicit clientConfig import type and config object for reference

• add client config option reference
• add client constructor type to command docs

---

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.