Update docs for error improvements

[jennifer-shehane]

I'm submitting a...

[ ] Bug report
[x] Content update
[ ] Process update (build, deployment, ... )

Type of bug / changes

• Documentation for Reporter error improvements cypress#3930

• Need link to https://on.cypress.io/file-opener-preference (clicked from 'learn more' in global settings where you change editor preferences

• Update screenshots of reporter if necessary

• Update Command Log section to have section explaining errors

• Need something to explain setting up source maps?