Add test_cpu_compat.md to gemstones

[sspencerwire]

• add alpha sort to .pages file in gemstones
• add links to procedure in 9.x release notes files

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 6050beb:

Number of broken URLs: 6

URL,RESULT,FILENAME
 https://azure.microsoft.com/en-us/,failed,guides/automation/templates-automation-packer-vsphere.md
 https://www.linode.com/docs/guides/beginners-guide-to-lxd-reverse-proxy,failed,guides/containers/lxd_web_servers.md
 https://docs.rockylinux.org/gemstones/test_cpu_compat/,failed,release_notes/9_3.md
 https://docs.rockylinux.org/gemstones/test_cpu_compat/,failed,release_notes/9_2.md
 https://docs.rockylinux.org/gemstones/test_cpu_compat/,failed,release_notes/9_1.md
 https://docs.rockylinux.org/gemstones/test_cpu_compat/,failed,release_notes/9_0.md