S3 code examples audit

[brmur]

The EPIC is for implementing our (code example standards) to our S3 examples. See S3 audit (internal link) for per language analysis.

• [x] #7079
• [x] #7070
• [x] #6977
• [ ] #6752
• [x] #6751
• [x] #6794
• [x] PHP S3 examples audit
• [ ] #6921
• [ ] Ruby S3 examples audit
• [x] #6719
• [ ] Swift S3 examples audit