Add example to use host parameters via Ansible (#4037)

Example error if host parameter is unset:
fatal: [foreman.example.com]: FAILED! => {"msg": "The task includes an option with an undefined variable. The error was: 'ansible.vars.hostvars.HostVarsVars object' has no attribute '_My_Host_Parameter_'. 'ansible.vars.hostvars.HostVarsVars object' has no attribute '_My_Host_Parameter_'\n\nThe error appears to be in '/tmp/d20250922-101358-j1ipdv/project/playbook.yml': line 5, column 7, but may\nbe elsewhere in the file depending on the exact syntax problem.\n\nThe offending line appears to be:\n\n  tasks:\n    - name: \"View a host parameter\"\n      ^ here\n"}

Example REX output:
TASK [View a host parameter] ***************************************************
ok: [foreman.example.com] => {
    "msg": "_Value_of_My_Host_Parameter_"
}

(cherry picked from commit 335131b)

Author: maximiliankolb

guides/common/modules/proc_running-an-ansible-playbook.adoc

@@ -36,3 +36,4 @@ For more information, see xref:executing-a-remote-job_{context}[].
 For more information, see the following resources:
 ** xref:importing-an-ansible-playbook-by-name_{context}[]
 ** xref:importing-all-available-ansible-playbooks_{context}[]
+* xref:host-parameters-in-ansible-playbooks[]

guides/common/modules/ref_host-parameters-in-ansible-playbooks.adoc

@@ -0,0 +1,26 @@
+:_mod-docs-content-type: REFERENCE
+
+[id="host-parameters-in-ansible-playbooks"]
+= Host parameters in Ansible Playbooks
+
+You can use host parameters from {Project} in Ansible Playbooks.
+
+.Example Ansible Playbook to access host parameters
+[source, yaml, options="nowrap", subs="+quotes,verbatim,attributes"]
+----
+---
+- name: "Ansible Playbook to access host parameters"
+  hosts: all
+  tasks:
+    - name: "View a host parameter"
+      ansible.builtin.debug:
+        msg: "{{ hostvars[inventory_hostname]['_My_Host_Parameter_'] }}"
+...
+----
+
+Ansible will access the host parameter and show its value.
+If you set the host parameter to an ERB template, for example, `<%= @host.capabilities.include?(:snapshots) %>`, {Project} will render it and provide the result to Ansible.
+Ansible receives only the rendered value, not the ERB template itself.
+
+.Additional resources
+* xref:Host_Parameter_Hierarchy_{context}[]

guides/doc-Managing_Configurations_Ansible/master.adoc

@@ -15,6 +15,8 @@ include::common/assembly_using-ansible-roles.adoc[leveloffset=+1]
 
 include::common/modules/proc_running-an-ansible-playbook.adoc[leveloffset=+1]
 
+include::common/modules/ref_host-parameters-in-ansible-playbooks.adoc[leveloffset=+2]
+
 include::common/assembly_configuring-and-setting-up-remote-jobs.adoc[leveloffset=+1]
 
 include::common/assembly_integrating-awx.adoc[leveloffset=+1]