Improve AWS findings (rationale+references)

[ramimac]

Description

I went through and added rationale and references to as many AWS findings as I could.
Ran the format_findings.py tool after

Type of change

Select the relevant option(s):

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works (optional)
• New and existing unit tests pass locally with my changes

[x4v13r64]

It's grunt work but someone's got to do it!

Between this PR and #679, AWS findings' content will be very much improved.

[ramimac]