fix: clarify that hardcoding env info is not recommended for prod

[Nicodl05]

Description

Documentation Change Type:

• Typo/grammar fix
• Clarification or minor improvement
• New example or code snippet
• New section or topic
• Major restructuring or enhancement

Affected Documentation Page(s):

• v2/guide/hello-world.adoc

Description of Changes

I clarified the "Step 2: Configure your AWS environment" section to:
Explicitly warn against hardcoding AWS account IDs and regions in application code, especially for production environments

Motivation and Context

Issue Identified:

The current tutorial implicitly encourages hardcoding AWS credentials (account ID, region) in the application file, which is:

• Insecure: Exposes credentials in source control.
• Inflexible: Requires code changes to switch accounts/regions.
• Against DevOps best practices

How Has This Been Validated?

Just a missing word, so nothing should break.

Screenshots (if appropriate)

No need

Checklist

• My changes follow the AsciiDoc syntax guidelines
• I have previewed my changes using GitHub's preview or a local AsciiDoc renderer
• My changes maintain consistent formatting with the rest of the documentation
• I have checked that all links work correctly

Additional Information