Update RationaleMCP/0031/annotations.md

Improved description of experiment annotation

Co-authored-by: Henrik Tidefelt <henrikt@wolfram.com>

RationaleMCP/0031/annotations.md

@@ -35,7 +35,7 @@ These are all the non-vendor specific annotations inherited from full Modelica t
 These are all the non-vendor specific annotations inherited from full Modelica that are relevant for parameter input and simulation output:
 - `HideResult` — Applied to a parameter or variable, implies the variable should not be included in the simulation output
 - `choices` — Applied to a parameter or variable, can be used to enumerate and tag different values for parameter input
-- `experiment` — Applied to the flat model, provide the default start time, stop time, tolerance, and interval length
+- `experiment` — In the class annotation of the `model`, provide the default start time, stop time, tolerance, and interval length
 
 These are the new annotations introduced in Base Modelica, each explained in more detail below:
 - [`Protected`](#protected) — Indicate whether component declaration comes from protected section in original full Modelica model