Clarify revert reason cli args behaviour

[antonydenyer]

Describe the change

Enabling the revert reason is done using cli args. The result will show up in eth_getTransactionReceipt without changing any params on the request.

Impacted parts

For content changes:

• Documentation content
• Documentation page organization

For tool changes:

• Build and QA tools (e.g., lint)
• MkDocs templates
• MkDocs configuration
• Python dependencies
• Node dependencies and JavaScript
• GitHub integration

After creating your PR and tests have finished

Make sure that:

• You've fixed any issues raised by the tests.
• You've previewed your changes on GitHub Pages

[rolandtyler]

Minor edits, LGTM