WSL docs update

[lumarel]

Author checklist (Completed by original Author)

• Contribution a good fit for the Rocky project? Title and Author MetaTags inserted ?
• Is this a non-English contribution?
• If applicable, steps and instructions have been tested to work on a real system
• Did you perform an initial self-review to fix basic typos and grammatical correctness

Rocky Documentation checklist (Completed by Rocky team)

• 1st Pass (Check that document is good fit for project and author checklist completed)
• 2nd Pass (Technical Review - check for technical correctness)
• 3rd Pass (Basic Editorial Review)
• 4th Pass (Detailed Editorial Review and Peer Review)
• Final pass/approval (Final Review)

[SergeCroise]

Proposal:
"The Windows-Subsystem for Linux feature has to be enabled. This is possible with one of these options:"

See:
#806
4f7c583#r84981415

[lumarel]

@SergeCroise Thanks for noticing!
Fixed that 👍🏻