Add instructions to collect git related info using environment variables (#1179)
Add instructions to collect git related info using environment variables (#1179)

* Update environment variables in continuous-integration.md

 - Renamed `Other Configuration Values` to `Configuration Values`
 - Placed `Record Key` under `Configuration Values`

* Add section for git info in continuous-integration.md

* Minor grammar edits

cypress-io/cypress-documentation,cypress-io/cypress-documentation