Fix spelling of boot loader

[maximiliankolb]

$ fd -e adoc | xargs sed -i "s/bootloader/boot loader/g"

Reverted change to URL manually.

What changes are you introducing?

Make vale happy: change "bootloader" to "boot loader".

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

prerequisite to https://github.com/theforeman/foreman-documentation/pull/3272/files

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

Checklists

• [ ] 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:

• [ ] Foreman 3.12/Katello 4.14 (Satellite 6.16)
• [ ] Foreman 3.11/Katello 4.13
• [ ] Foreman 3.10/Katello 4.12
• [ ] Foreman 3.9/Katello 4.11 (Satellite 6.15; orcharhino 6.8/6.9/6.10)
• [ ] Foreman 3.8/Katello 4.10
• [ ] Foreman 3.7/Katello 4.9 (Satellite 6.14)
• [ ] Foreman 3.6/Katello 4.8
• [ ] 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 138801dd387f29c4b858568aa69358f5ddef497b is available at theforeman-foreman-documentation-preview-pr-3274.surge.sh

The following output files are affected by this PR:

• Managing_Hosts/index-foreman-el.html
• Managing_Hosts/index-katello.html
• Managing_Hosts/index-orcharhino.html
• Managing_Hosts/index-satellite.html

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