Fix broken link and add resource

[cyrilbois]

Fix broken link in docs/guides/communications/asterisk_installation.it.md and asterisk_installation.ko.md
Add Cyrilex (my website), an online visual regex tester, to "Introducing regular expressions" in docs/books/sed_awk_grep/1_regular_expressions_vs_wildcards.md and 1_regular_expressions_vs_wildcards.uk.md

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)

[sspencerwire]

@cyrilbois Thanks for your efforts here! Unfortunately, making changes to language files, other than English, is not allowed within this process. We have a Crowdin interface where translators take the English source document and then translate it into their language of choice. Making changes outside of this environment causes problems there.
This file: "docs/books/sed_awk_grep/1_regular_expressions_vs_wildcards.md" is OK to change. If you would like to remove the 3 other files, I'll merge your change to that file. Thank you again! If you have questions, please don't hesitate to ask.

[github-actions]

Test results for 4f1057f:

Number of broken URLs: 2

URL,RESULT,FILENAME
 http://www.neelc.org/,failed,guides/contribute/README.md
 https://certbot.eff.org/instructions?ws=apache&os=centosrhel8,failed,guides/security/generating_ssl_keys_lets_encrypt.md

[cyrilbois]

@sspencerwire Thank you for the explanations! I removed the language files.

[sspencerwire]

@all-contributors add @cyrilbois for content

[allcontributors]

@sspencerwire

I've put up a pull request to add @cyrilbois! 🎉