fix: correct Liquid syntax in PAGE_EVENTS documentation

- Updated the conditional logic in the PAGE_EVENTS documentation to properly display messages based on the awarded grant value.
- Replaced the incorrect closing tag with an else statement to enhance clarity and ensure accurate rendering of the content.

Author: mokhld

docs/features/configuration-based/PAGE_EVENTS.md

@@ -117,7 +117,7 @@ Page template:
 ```jinja2
 {% if context.data.awardedGrantValue %}
   <p class="govuk-body">Congratulations. You are likely to receive up to £{{ context.data.awardedGrantValue }}.</p>
-{% endif %}
+{% else %}
   <p class="govuk-body">You have not been awarded any funding for this application.</p>
 {% endif %}
 ```