Fixed spelling mistake "son" to "json"

Fixed aligning to the guidelines in https://docs.microsoft.com/en-us/contribute/code-in-docs#fenced-code-blocks

Author: dinet

articles/azure-functions/functions-reference-python.md

@@ -17,7 +17,7 @@ Azure Functions expects a function to be a stateless method in your Python scrip
 
 Data from triggers and bindings is bound to the function via method attributes using the `name` property defined in the *function.json* file. For example, the  _function.json_ below describes a simple function triggered by an HTTP request named `req`:
 
-:::code language="son" source="~/functions-quickstart-templates/Functions.Templates/Templates/HttpTrigger-Python/function.json":::
+:::code language="json" source="~/functions-quickstart-templates/Functions.Templates/Templates/HttpTrigger-Python/function.json":::
 
 Based on this definition, the `__init__.py` file that contains the function code might look like the following example: