Update procedure for TLS for secure LDAP connection

[aneta-petrova]

What changes are you introducing?

• Highlighting an existing prerequisite as an actual prerequisite so it's harder to miss
• Adding a step to restart services
• EDIT: Updating cert location

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

https://issues.redhat.com/browse/SAT-32048

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

Somewhat related to #3941 which also adds a step to restart services after updating certs.

Contributor checklists

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

Please cherry-pick my commits into:

• Foreman 3.16/Katello 4.18 (Satellite 6.18)
• Foreman 3.15/Katello 4.17
• Foreman 3.14/Katello 4.16 (Satellite 6.17; orcharhino 7.4)
• Foreman 3.13/Katello 4.15 (EL9 only)
• Foreman 3.12/Katello 4.14 (Satellite 6.16; orcharhino 7.2 on EL9 only; orcharhino 7.3)
• Foreman 3.11/Katello 4.13 (orcharhino 6.11 on EL8 only; orcharhino 7.0 on EL8+EL9; orcharhino 7.1 with Leapp)
• Foreman 3.10/Katello 4.12
• Foreman 3.9/Katello 4.11 (Satellite 6.15; orcharhino 6.8/6.9/6.10)
• We do not accept PRs for Foreman older than 3.9.

Review checklists

Tech review (performed by an Engineer who did not author the PR; can be skipped if tech review is unnecessary):

• The PR documents a recommended, user-friendly path.
• The PR removes steps that have been made unnecessary or obsolete.
• Any steps introduced or updated in the PR have been tested to confirm that they lead to the documented end result.

Style review (by a Technical Writer who did not author the PR):

• The PR conforms with the team's style guidelines.
• The PR introduces documentation that describes a user story rather than a product feature.

[github-actions]

The PR preview for 4f1692a is available at theforeman-foreman-documentation-preview-pr-4257.surge.sh

The following output files are affected by this PR:

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

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show diff as HTML

[aneta-petrova]

Tech ack shared in https://issues.redhat.com/browse/SAT-32048 (private comment, sorry, but it's there).

[ekohl]

I can confirm @waldirio acked in a private comment.

@waldirio next time feel free to review the PR in GitHub. Anyone (even those without commit access) can leave a review and it makes the process more transparent.

[maximiliankolb]

style-wise LGTM

[aneta-petrova]

Merged to "master" and cherry-picked:

7b5b31e..90caa45 3.16 -> 3.16
65eb2af..f9fccf7 3.15 -> 3.15
8f93983..dbf7c6a 3.14 -> 3.14
31901b7..94e445c 3.13 -> 3.13
6694e2c..d65f1d0 3.12 -> 3.12