docs: improve timezone module examples and add hwclock usage (#11685)

* docs: add variable-based example for timezone module

### Summary
Added a variable-based example to the EXAMPLES section of the timezone module.

### Changes
- Added an example demonstrating how to set timezone dynamically using a variable

### Motivation
Using variables is a common practice in Ansible playbooks. This example helps users understand how to make the module usage more flexible and reusable.

* docs: improve timezone module examples with hwclock usage

### Summary
Improved the EXAMPLES section of the timezone module by adding a more meaningful, module-specific example.

### Changes
- Added an example demonstrating usage of the `hwclock` parameter
- Simplified examples to avoid redundancy
- Fixed formatting issues causing CI failures (invalid YAML, lint errors)

### Motivation
The previous examples were minimal and did not demonstrate module-specific features. This update adds a more practical use case and ensures the examples follow proper formatting and validation rules.

plugins/modules/timezone.py

@@ -60,6 +60,11 @@ EXAMPLES = r"""
   become: true
   community.general.timezone:
     name: Asia/Tokyo
+
+- name: Set timezone and hardware clock to UTC
+  community.general.timezone:
+    name: UTC
+    hwclock: UTC
 """
 
 import errno