Docs: Hard to read line

[rvveber]

incus/doc/howto/projects_create.md

Line 14 in 74c3c71

For example, to create a project called `my-project` that isolates instances, but allows access to the default project's images and profiles, enter the following command:

Upon reading this documentation, i came to a fullstop when reading this line.
... that isolates instances, but allows access to the default project’s images and profiles ...

• Optimize the reading flow
• No quickly injected knowledge about unrelated but important information
  If it is important, it should get its attention in peace, not in a hurry

Noone will copy and execute a command, without informing themselves about the meanings of the parameters.