Fixed a spelling mistake.

[Rody10]

Line 164 under Excercise 1 of Lab 6: User and group management has a spelling error. It says "... makes the system vulnerable, securityi-wise." instead of "... makes the system vulnerable, security-wise."

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 03bbf0a:

Number of broken URLs: 2

URL,RESULT,FILENAME
 https://azuremarketplace.microsoft.com/en-us/marketplace/apps/resf.rockylinux-aarch64,failed,guides/cloud/migration-to-new-azure-images.md
 https://rockylinux.org/community-charter/,failed,guides/contribute/README.md

[sspencerwire]

Thanks for catching this @Rody10 !

[Rody10]

You're welcome @sspencerwire!