Add link to environments on kubernetes.md

What does this MR do?

Add's link.

Are there points in the code the reviewer needs to double check?

Why was this MR needed?

Someone was confused that they needed to define their environment in .gitlab-ci.yml to use web terminal.

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• API support added
• Tests
  • Added for this feature/bug
  • All builds are passing
• Conform by the merge request performance guides
• Conform by the style guides
• Branch has no merge conflicts with master (if it does - rebase it please)
• Squashed related commits together

What are the relevant issue numbers?

assigned to @markpundsack

changed milestone to %9.1

added ~19173 ~15078 ~149423 labels

resolved all discussions

@axil Done.

assigned to @axil

added 1 commit

• e0b7ce16 - Update kubernetes.md

Compare with previous version

enabled an automatic merge when the pipeline for e0b7ce16 succeeds

canceled the automatic merge

enabled an automatic merge when the pipeline for e0b7ce16 succeeds

Great thanks!

canceled the automatic merge

merged

mentioned in commit defdf45a

Picked into 9-1-stable, will go into 9.1.0-rc2

mentioned in commit 2cd9c263