style(): fix generated header comment linting

[LMFinney]

Tweak the format of the generated header comment so that it doesn't conflict with https://palantir.github.io/tslint/rules/jsdoc-format/.

The file has tslint disabled, but this comment is above the disabling, so it can still report a problem.

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/nestjs/nest/blob/master/CONTRIBUTING.md
• [N/A] Tests for the changes have been added (for bug fixes / features)
• [N/A] Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[ ] Feature
[X] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Other... Please describe:

What is the current behavior?

The header comment for generated files does not follow tsdoc conventions.

Issue Number: N/A

What is the new behavior?

The header comment for generated files does follow tsdoc conventions.

Does this PR introduce a breaking change?

[X] Yes
[ ] No

Other information

[kamilmysliwiec]

Can you update the integration tests too?

[LMFinney]

@kamilmysliwiec Thanks for pointing that out. I've updated the integration tests.
I also added a dash to the first line of the header to match the last line.

I added it as a separate commit - I don't know if this project would have preferred an amend or squash.

[kamilmysliwiec]

This will be added in 8.0.0 release