Add requirement for setting DEBUG when testing Alexa Smart Home

[jcam]

Proposed change

Added notes about setting DEBUG mode when testing the Lambda for Alexa Smart Home

I chose not to go deep on correcting the grammar errors in the documentation, and kept the changes minimal.

Type of change

• Spelling, grammar or other readability improvements (current branch).
• Adjusted missing or incorrect information in the current documentation (current branch).
• Added documentation for a new integration I'm adding to Home Assistant (next branch).
  • I've opened up a PR to add logo's and icons in Brands repository.
• Added documentation for a new feature I'm adding to Home Assistant (next branch).
• Removed stale or deprecated documentation.

Additional information

Here is the line in the python script that sets DEBUG as required:
https://gist.github.com/matt2005/744b5ef548cc13d88d0569eea65f5e5b#file-lambda_function-py-L51

Checklist

• This PR uses the correct branch, based on one of the following:
  • I made a change to the existing documentation and used the current branch.
  • I made a change that is related to an upcoming version of Home Assistant and used the next branch.
• The documentation follows the Home Assistant documentation standards.

[frenck]

Thanks, @jcam 👍