Add docker+machine and kubernetes executors to "I'm not sure" part of executors

Tomasz Maczukin requested to merge docs/update-executors-documentation into master

What does this MR do?

Adds Docker Machine executor (existing already) and Kubernetes executor (new one) to "I'm not sure" section in executors

Why was this MR needed?

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

Does this MR meet the acceptance criteria?

  • CHANGELOG entry added
  • Documentation created/updated
  • Tests
    • Added for this feature/bug
    • All builds are passing
  • Branch has no merge conflicts with master (if you do - rebase it please)

What are the relevant issue numbers?

Closes #1684 (closed)

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