Update Magento_AmqpStore ReadMe

[diazwatson]

Description (*)

Updates ReadMe for the Magento_AmqpStore module.

Fixed Issues (if relevant)

1. magento/devdocs README content for modules - work in M2 Code devdocs#4451: README content for modules - work in M2 Code

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds are green)

[m2-assistant]

Hi @diazwatson. Thank you for your contribution
Here is some useful tips how you can test your changes using Magento test environment.
Add the comment under your pull request to deploy test or vanilla Magento instance:

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[magento-engcom-team]

Hi @jeff-matthews, thank you for the review.
ENGCOM-5707 has been created to process this Pull Request

[engcom-Delta]

Notice: QA not applicable

[engcom-Foxtrot]

@magento run all tests

[m2-assistant]

Hi @diazwatson, thank you for your contribution!
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