typecheck: name methods in field diagnostics

docs/ADVANCED_STATIC_TYPING.md

@@ -825,7 +825,7 @@ Output:
 Function greet needs 1 argument, but this call gives 0. Add the missing argument.
 ```
 
-The same operator-specific diagnostic is used inside a typed method when it updates a class field by its simple name. For example, `SET score score + name` inside `Player.add RETURNS NUMBER` reports `Type mismatch for field score in Player.add: addition needs NUMBER values, but name looks like TEXT.` instead of describing the field as an ordinary variable. This focused check covers typed method bodies; broader control-flow and object-flow analysis remains planned.
+The same method-aware diagnostic is used when a method directly assigns the wrong value to a class field. For example, `SET name 123` inside `Player.rename` reports `Type mismatch for field name in Player.rename: expected TEXT, but this value looks like NUMBER.` The operator-specific form also remains available: `SET score score + name` inside `Player.add RETURNS NUMBER` reports `Type mismatch for field score in Player.add: addition needs NUMBER values, but name looks like TEXT.` These focused checks cover typed method bodies; broader control-flow and object-flow analysis remains planned.
 
 ## Status