[HttpKernel] Change exception message in case no controller found
minor #11769 [HttpKernel] Change exception message in case no controller found (ghostika)

This PR was squashed before being merged into the 2.6-dev branch (closes #11769).

Discussion
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[HttpKernel] Change exception message in case no controller found

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #11754
| License       | MIT
| Doc PR        | n/a

Change the NotFoundHttpException message.

Commits
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b0a839c [HttpKernel] Change exception message in case no controller found