Propose SQL typing RFC suggestions
Propose SQL typing RFC suggestions

The changes primarily consist of:
- Changing type names in examples to be consistent with CockroachDB's
  implementation (ie. `text` -> `string`, `bytea` -> `bytes`)
- Introducing another unresolved question
- Adding a few links
- Spelling and grammar changes

vaibhavarora/cockroach,glycerine/cockroach,glycerine/cockroach,maxlang/cockroach,veteranlu/cockroach,vivekmenezes/cockroach,paperstreet/cockroach,sunya123/cockroach,paperstreet/cockroach,il9ue/cockroach,petermattis/cockroach,il9ue/cockroach,vaibhavarora/cockroach,glycerine/cockroach,vaibhavarora/cockroach,sunya123/cockroach,cockroachdb/cockroach,il9ue/cockroach,glycerine/cockroach,sunya123/cockroach,petermattis/cockroach,cockroachdb/cockroach,arjun4084346/cockroach,paperstreet/cockroach,paperstreet/cockroach,cockroachdb/cockroach,il9ue/cockroach,petermattis/cockroach,vivekmenezes/cockroach,veteranlu/cockroach,vivekmenezes/cockroach,sunya123/cockroach,arjun4084346/cockroach,cuongdo/cockroach,cockroachdb/cockroach,nieyy/cockroach,paperstreet/cockroach,veteranlu/cockroach,cuongdo/cockroach,vivekmenezes/cockroach,petermattis/cockroach,paperstreet/cockroach,glycerine/cockroach,maxlang/cockroach,bg451/cockroach,maxlang/cockroach,cuongdo/cockroach,vivekmenezes/cockroach,cuongdo/cockroach,bg451/cockroach,maxlang/cockroach,nieyy/cockroach,maxlang/cockroach,arjun4084346/cockroach,veteranlu/cockroach,glycerine/cockroach,nieyy/cockroach,vivekmenezes/cockroach,il9ue/cockroach,vaibhavarora/cockroach,sunya123/cockroach,cuongdo/cockroach,cuongdo/cockroach,il9ue/cockroach,maxlang/cockroach,paperstreet/cockroach,arjun4084346/cockroach,arjun4084346/cockroach,petermattis/cockroach,glycerine/cockroach,cockroachdb/cockroach,bg451/cockroach,arjun4084346/cockroach,veteranlu/cockroach,glycerine/cockroach,vivekmenezes/cockroach,sunya123/cockroach,il9ue/cockroach,petermattis/cockroach,nieyy/cockroach,il9ue/cockroach,vaibhavarora/cockroach,cockroachdb/cockroach,nieyy/cockroach,cockroachdb/cockroach,bg451/cockroach,veteranlu/cockroach,vivekmenezes/cockroach,vaibhavarora/cockroach,bg451/cockroach,maxlang/cockroach,nieyy/cockroach,arjun4084346/cockroach,maxlang/cockroach,bg451/cockroach,veteranlu/cockroach,petermattis/cockroach,paperstreet/cockroach,bg451/cockroach,arjun4084346/cockroach,veteranlu/cockroach,sunya123/cockroach,vaibhavarora/cockroach,sunya123/cockroach,nieyy/cockroach,cuongdo/cockroach,cuongdo/cockroach,vaibhavarora/cockroach,cockroachdb/cockroach,nieyy/cockroach,petermattis/cockroach