chore: Update jinja block examples in analytics documentation

docs/4_analytics.md

@@ -470,9 +470,9 @@ We can use three different types of jinja blocks within a [macro](https://docs.g
 
 * `Expressions` : when we want to return a string. Expressions can be used to reference variables or call other macros. `{{ }}`
 
-* `Statements` : These are used for flow control, for example, for loops or statements. `{% xxx %} FOR IF`
+* `Statements` : These are used for flow control, for example, for loops or statements. `{% %} FOR IF`
 
-* `Comments`: The text of the comment is not compiled, it allows us to indicate notes. `{# xxx #}`
+* `Comments`: The text of the comment is not compiled, it allows us to indicate notes. `{# #}`
 
 we create the macros `get_payment_type_description` that receives a value called `payment_type`