EC2 examples - implement new standards

[brmur]

The EPIC is for implementing our code example standards (internal link) to our EC2 examples. See EC2 audit (internal link) for per language analysis.

• [x] #6616
• [x] #6608
• [x] #6618
• [ ] #6619
• [x] #6614
• [x] #6620
• [ ] #6612
• [x] #6621
• [x] #6622