Fixes #37942 - Updating Job Template Documentation with Ansible Check Mode Option

What changes are you introducing?

This PR adds a line of documentation explaining a new Enable Ansible Check Mode option within Ansible Job Templates describing its basic functionality.

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

This documentation explains the new functionality introduced in the following PRs:

https://github.com/theforeman/foreman_ansible

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

This PR is dependent on the following PRs being approved/merged first:

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:

[ ] 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.

theforeman / foreman-documentation

Fixes #37942 - Updating Job Template Documentation with Ansible Check Mode Option #3391

What changes are you introducing?

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

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

Checklists