Improve failed_when documentation and fix minor errors

[malikdotexe]

SUMMARY
Improve the Ansible error handling documentation by clarifying failed_when conditions and fixing minor syntax errors.

ISSUE TYPE

• Docs Pull Request

COMPONENT NAME
playbook_guide/playbooks_error_handling.rst

ANSIBLE VERSION
N/A

ADDITIONAL INFORMATION
This PR makes three key improvements to the error handling documentation:

1. Enhanced failed_when explanation: Added a practical example showing how to use the or operator in failed_when conditions, making it clearer that users can trigger failure when ANY condition is met (not just all conditions).

2. Template syntax fix: Corrected malformed Jinja2 braces by removing extra space in {{ log_path }}{{ log_file }}.

These changes improve readability and correctness of the documentation without changing any functionality.

[ansible-documentation-bot]

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[malikdotexe]

Thanks for the review! I’ve applied your suggested change. Let me know if anything else is needed.