Improved wireguard_vpn.md quality and readability

[j0eybrinkman]

• Fixed a few typos
• Added -y to commands so user input isn't required
• Changed public/private key pair naming scheme to interface name (less confusing)
• Rearranged and re-worded some content for better readability
• Changed editor to vi since vim isn't always installed by default
• Added instructions on permanently adding peers to interface

Author checklist (Completed by original Author)

• Good fit for the Rocky Linux project? Title and Author Metatags inserted ?
• If applicable, steps and instructions have been tested to work
• Initial self-review to fix basic typos and grammar completed

Rocky Documentation checklist (Completed by Rocky team)

• 1st Pass (Document is good fit for project and author checklist completed)
• 2nd Pass (Technical Review - check for technical correctness)
• 3rd Pass (Detailed Editorial Review and Peer Review)
• Final approval (Final Review)

[github-actions]

Test results for 1848fa0:

Number of broken URLs: 4

URL,RESULT,FILENAME
 http://www.example.org/foo.txt,failed,books/web_services/052-load-balancer-proxies-varnish.md
 https://azuremarketplace.microsoft.com/en-us/marketplace/apps/resf.rockylinux-aarch64,failed,guides/cloud/migration-to-new-azure-images.md
 https://kb.vmware.com/s/article/71264,failed,guides/automation/templates-automation-packer-vsphere.md
 https://www.winehq.org/,failed,desktop/gaming/proton.md