update getContext arg by adding quote

Co-authored-by: Fabian Kägy <mail@fabian-kaegy.de>

docs/reference-guides/interactivity-api/api-reference.md

@@ -1057,7 +1057,7 @@ Apart from the store function, there are also some methods that allows the devel
 Retrieves the context inherited by the element evaluating a function from the store. The returned value depends on the element and the namespace where the function calling `getContext()` exists. It can also take an optional namespace argument to retrieve the context of a specific interactive region.
 
 ```js
-const context = getContext(namespace);
+const context = getContext('namespace');
 ```
 - `namespace` (optional): A string that matches the namespace of an interactive region. If not provided, it retrieves the context of the current interactive region.