fix left over closing backticks
Merge pull request #6659 from nkovacs/patch-2

[skip ci] fix left over closing backticks
Fixes #6618: Added Model::addErrors()
Fixes #6624: Added delays to acceptance tests in order to make Selenium run more reliable
Fixes #6464: `path` and `url` weren't resolving aliases
Fixes #6554: clarified docs about AccessRule::$roles
minor rewording [skip ci]
Fixes #6589: updated code style guide to mention else after return, adjusted code involved in the issue
resolve #3335 - add SchemaType