#1867 fix markdown violation in books/admin_guide

[nishaaaaaant]

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 2ef09d8:

Number of broken URLs: 10

URL,RESULT,FILENAME
 https://reddit.com/r/rockylinux,failed,release_notes/9_1.md
 https://reddit.com/r/rockylinux,failed,release_notes/8_7.md
 https://reddit.com/r/rockylinux,failed,release_notes/8_5.md
 https://reddit.com/r/rockylinux,failed,release_notes/9_3.md
 https://reddit.com/r/rockylinux,failed,release_notes/9_2.md
 https://reddit.com/r/rockylinux,failed,release_notes/9_0.md
 https://reddit.com/r/rockylinux,failed,release_notes/8_6.md
 https://reddit.com/r/rockylinux,failed,release_notes/8_9.md
 https://reddit.com/r/rockylinux,failed,release_notes/8_8.md
 https://hbjy.dev/,failed,guides/contribute/README.md

[sspencerwire]

@nishaaaaaant While it looks like everything is fine here, I prefer a shorter list of files to scan through, FYI. Doing an entire section all at once is a bit much to verify. That said, "Thank You" for your work! It is appreciated.