Fix heading of Discovery settings

[Lennonka]

What changes are you introducing?

Fixing the heading of "Discovered settings" reference

Why are you introducing these changes? (Explanation, links to references, issues, etc.)

It's wrong. It's supposed to be "Discovery settings"

Anything else to add? (Considerations, potential downsides, alternative solutions you have explored, etc.)

Checklists

• [x] I am okay with my commits getting squashed when you merge this PR.
• [x] I am familiar with the contributing guidelines.

Please cherry-pick my commits into:

• [x] Foreman 3.12/Katello 4.14 (Satellite 6.16)
• [x] Foreman 3.11/Katello 4.13
• [x] Foreman 3.10/Katello 4.12
• [x] Foreman 3.9/Katello 4.11 (Satellite 6.15; orcharhino 6.8/6.9/6.10)
• [x] Foreman 3.8/Katello 4.10
• [x] Foreman 3.7/Katello 4.9 (Satellite 6.14)
• [x] Foreman 3.6/Katello 4.8
• [x] Foreman 3.5/Katello 4.7 (Satellite 6.13; orcharhino 6.6/6.7)
• We do not accept PRs for Foreman older than 3.5.

[github-actions[bot]]

The PR preview for bf5a88a41a7ed7a255085579936cd2bd090afd9c is available at theforeman-foreman-documentation-preview-pr-3399.surge.sh

The following output files are affected by this PR:

• Administering_Project/index-foreman-deb.html
• Administering_Project/index-foreman-el.html
• Administering_Project/index-katello.html
• Administering_Project/index-orcharhino.html
• Administering_Project/index-satellite.html

show diff

show diff as HTML

[Lennonka]

This is a small doc fix, therefore, tech review is not needed and I'm setting the tech review done label.

[asteflova]

Merged to "master" and cherry-picked:

353fbf690f..1f0eadc31c 3.12 -> 3.12 0428c3f953..e5e7e238df 3.11 -> 3.11 9a81ebe70a..8cd0f43195 3.10 -> 3.10 aa43aee93f..4ff313d8e5 3.9 -> 3.9

FYI @Lennonka I'm not cherry-picking further due to conflicts because of the switch to lower case headings.