Update linux instructions to use Linux Emulator Cosmos

[lucassouzamatos]

For use the Cosmos Emulator correctly, the port 10255 need is available too, added in documentation.

[Jak-MS]

@seesharprun - Can you review this PR?

IMPORTANT: When this content is ready to merge, you must add #sign-off in a comment or the approval may get overlooked.

#label:"aq-pr-triaged" @MicrosoftDocs/public-repo-pr-review-team

[lucassouzamatos]

Closing here because the error was fixed with another PR.