Improvement to readability of footer "update" command text

[esqew]

Signed-off-by: Sean F Quinn sean@esqew.com

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• 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.
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What does this PR aim to accomplish?:
Fix for #1796 (readability and standardization for the Pi-Hole update command in the interface)

How does this PR accomplish the above?:
Wrapped the command text in a <code></code> element.

What documentation changes (if any) are needed to support this PR?:
None!

[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-ftl-v5-9-web-v5-6-and-core-v5-4-released/49544/1