fix broken markdown

xtask/res/templates/runtime-calls-category.md

@@ -19,7 +19,8 @@ There are **{{ calls_counter }}** {{ category_name }} calls from **{{ pallets |
 ```
 </details>
 
-{{ call.documentation }}
+{# replace markdown sytax in documentation breaking the final result #}
+{{ call.documentation | replace(from="# WARNING:", to="WARNING"}}
 
 {% endfor -%}
 {% endfor -%}