CODEOWNERS: fix syntax

According to https://help.github.com/articles/about-codeowners/

:

The `docs/*` pattern will match files like
`docs/getting-started.md` but not further nested files like
`docs/build-app/troubleshooting.md`.

	docs/*  docs@example.com

In this example, @octocat owns any file in an apps directory
anywhere in your repository.

	apps/ @octocat

Signed-off-by: Anas Nashif <anas.nashif@intel.com>