PSR-12 errata, clarity and meta

[samdark]

Need to check the following issues and discussions that came after PSR-12 was accepted:

• php-fig/fig-standards#1206
• https://groups.google.com/g/php-fig/c/LItcyM27ll0/m/0Iq00esqBgAJ
• https://groups.google.com/g/php-fig/c/4gZe07mWWvk/m/up8rgfe4AgAJ
• https://groups.google.com/g/php-fig/c/nbpm5wLTt2w/m/mlYP5lXFAwAJ
• https://groups.google.com/g/php-fig/c/J77aMA9LLaU/m/CF9Xq_uFAQAJ
• https://groups.google.com/g/php-fig/c/9RybRUHLWuU/m/TQbyJ-47BgAJ
• https://groups.google.com/g/php-fig/c/VWcw3NnNHnM/m/HIyWQk2EBwAJ
• https://groups.google.com/g/php-fig/c/F0IVXx1LL_Q/m/62QdL7_pDQAJ
• https://groups.google.com/g/php-fig/c/FloEjPcgIag/m/K3a-d-VxBQAJ

[TimWolla]

• https://groups.google.com/g/php-fig/c/9RybRUHLWuU/m/TQbyJ-47BgAJ

That one likely is resolved with #18.

[TimWolla]

• https://groups.google.com/g/php-fig/c/J77aMA9LLaU/m/CF9Xq_uFAQAJ

Appears to be resolved with #40.

[Crell]

I'm going to mark this completed. Most of the above comments have been done; the ones that haven't have a reason as stated in those threads.