Remove duplicate DNSSEC explanation

[vmstan]

By submitting this pull request, I confirm the following: {please fill any appropriate checkboxes, e.g: [X]}

{Please ensure that your pull request is for the 'devel' branch!}

• I have read and understood the contributors guide, as well as this entire template.
• I have made only one major change in my proposed changes.
• I have commented my proposed changes within the code.
• I have tested my proposed changes.
• I am willing to help maintain this change if there are issues with it later.
• I give this submission freely and claim no ownership.
• It is compatible with the EUPL 1.2 license
• I have squashed any insignificant commits. (git rebase)
• I have Signed Off all commits. (git commit --signoff)

---

What does this PR aim to accomplish?:

Remove duplicate DNSSEC explanation

How does this PR accomplish the above?:

Deletes duplicated HTML code

What documentation changes (if any) are needed to support this PR?:

None

[dschaper]

Can you follow the directions on https://github.com/pi-hole/AdminLTE/pull/1494/checks?check_run_id=878035149 and update the commits please?

[vmstan]

Can you follow the directions on https://github.com/pi-hole/AdminLTE/pull/1494/checks?check_run_id=878035149 and update the commits please?

Sorry about that, my first time submitting to someone else's repo.

[dschaper]

No problem, meant as a friendly reminder but I see that it reads kind of abrasive.

[vmstan]

Nope. All good!

[pralor-bot]

This pull request has been mentioned on Pi-hole Userspace. There might be relevant details there:

https://discourse.pi-hole.net/t/pi-hole-core-web-v5-2-and-ftl-v5-3-released/40909/1