update doc ng e2e --no-serve not documented

[chaouiy]

Many Angular-cli users look for a way to run e2e tests without running the server. this option exists but it's not documented

[ineeve]

Documentation is still very poor on ng e2e. I think that at least one example should be provided for each option.

[angular-automatic-lock-bot]

This issue has been automatically locked due to inactivity.
Please file a new issue if you are encountering a similar or related problem.

Read more about our automatic conversation locking policy.

_{This action has been performed automatically by a bot.}