Grammar and formatting changes for mtr Gemstones page

[neelchauhan]

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 6a17a6b:

Number of broken URLs: 3

URL,RESULT,FILENAME
 https://www.yourdomain.com/,failed,guides/security/generating_ssl_keys_lets_encrypt.md
 https://www.linode.com/docs/guides/beginners-guide-to-lxd-reverse-proxy,failed,guides/containers/lxd_web_servers.md
 https://coding.tools/regex-tester,failed,books/admin_guide/15-three-swordsmen.md

[sspencerwire]

@neelchauhan Thank you! The semi-colons at the end of the line always bugged me. Bullet points need no punctuation. That said, capitalization is a judgment call. For future reference, if you are making changes to a document anyway, the old syntax for keyboard shortcuts now has a markdown equivalent: ++key++. For multiple keystrokes, it is ++key+key++ and so on.