doc/project: improve doc on set_variables() behavior in a recipe

Author: jfyuen

dataikuapi/dss/project.py

@@ -534,7 +534,10 @@ def get_variables(self):
     def set_variables(self, obj):
         """
         Sets the variables of this project.
-        @param obj: must be a modified version of the object returned by get_variables
+        WARNING: when executed in a python recipe (single run), the changes made by `set_variables` will not be "seen" in the recipe.
+                 Use the internal API instead if this behavior is needed
+
+        @param dict obj: must be a modified version of the object returned by get_variables
         """
         if not "standard" in obj:
             raise ValueError("Missing 'standard' key in argument")