Add examples

doc/data/messages/f/functools-cache-decorating-method/bad.py

@@ -0,0 +1,7 @@
+import functools
+
+
+class MyClassWithMethods:
+    @functools.cache  # [functools-cache-decorating-method]
+    def my_func(self, param):
+        return param + 1

doc/data/messages/f/functools-cache-decorating-method/good.py

@@ -0,0 +1,3 @@
+class MyClassWithMethods:
+    def my_func(self, param):
+        return param + 1

pylint/checkers/stdlib.py

@@ -569,7 +569,10 @@ def visit_boolop(self, node: nodes.BoolOp) -> None:
         for value in node.values:
             self._check_datetime(value)
 
-    @utils.check_messages("lru-cache-decorating-method")
+    @utils.check_messages(
+        "lru-cache-decorating-method",
+        "functools-cache-decorating-method",
+    )
     def visit_functiondef(self, node: nodes.FunctionDef) -> None:
         if node.decorators and isinstance(node.parent, nodes.ClassDef):
             self._check_lru_cache_decorators(node.decorators)