✏️ Fix typo in aggregation doc

docs/mongodb-rest/aggregations.adoc

@@ -108,7 +108,7 @@ To leverage this feature, you can utilize the `?avars` query parameter when maki
 
 It's important to note that the value of a variable can be any valid JSON. This means you can pass various data types, including strings and complex objects. For instance:
 
-[source,http]
+[source]
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 ?avars={ "name": "Bob", "obj": {"a": { "json": "object" }} }
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@@ -123,7 +123,7 @@ A crucial point to remember is that if an aggregation relies on a variable, such
 
 Starting from RESTHeart version 7.6, the `$var` operator also supports dot notation. This means you can navigate through nested JSON structures within variables. For instance:
 
-[source,http]
+[source]
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 ?avars={ "foo": {"bar": 1 }
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