docs: update PAGE_EVENTS documentation to include raw Liquid syntax

- Added {% raw %} and {% endraw %} tags to properly wrap Liquid syntax in the example code block.
- Ensured clarity in the documentation regarding the conditional display of awarded grant values.

Author: mokhld

docs/features/configuration-based/PAGE_EVENTS.md

@@ -115,11 +115,12 @@ Your API response:
 Page template:
 
 ```text
+{% raw %}
 {% if context.data.awardedGrantValue %}
   <p class="govuk-body">Congratulations. You are likely to receive up to £{{ context.data.awardedGrantValue }}.</p>
 {% endif %}
   <p class="govuk-body">You have not been awarded any funding for this application.</p>
-{% endif %}
+{% endraw %}
 ```
 
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