Rename Red Knot (#17820)

crates/ty_python_semantic/resources/mdtest/loops/iterators.md

@@ -0,0 +1,19 @@
+# Iterators
+
+## Yield must be iterable
+
+```py
+class NotIterable: ...
+
+class Iterator:
+    def __next__(self) -> int:
+        return 42
+
+class Iterable:
+    def __iter__(self) -> Iterator:
+        return Iterator()
+
+def generator_function():
+    yield from Iterable()
+    yield from NotIterable()  # error: "Object of type `NotIterable` is not iterable"
+```