Rename Red Knot (#17820)

crates/ty_python_semantic/resources/mdtest/shadowing/class.md

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+# Classes shadowing
+
+## Implicit error
+
+```py
+class C: ...
+
+C = 1  # error: "Implicit shadowing of class `C`"
+```
+
+## Explicit
+
+No diagnostic is raised in the case of explicit shadowing:
+
+```py
+class C: ...
+
+C: int = 1
+```

crates/ty_python_semantic/resources/mdtest/shadowing/function.md

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+# Function shadowing
+
+## Parameter
+
+Parameter `x` of type `str` is shadowed and reassigned with a new `int` value inside the function.
+No diagnostics should be generated.
+
+```py
+def f(x: str):
+    x: int = int(x)
+```
+
+## Implicit error
+
+```py
+def f(): ...
+
+f = 1  # error: "Implicit shadowing of function `f`"
+```
+
+## Explicit shadowing
+
+```py
+def f(): ...
+
+f: int = 1
+```
+
+## Explicit shadowing involving `def` statements
+
+Since a `def` statement is a declaration, one `def` can shadow another `def`, or shadow a previous
+non-`def` declaration, without error.
+
+```py
+f = 1
+reveal_type(f)  # revealed: Literal[1]
+
+def f(): ...
+
+reveal_type(f)  # revealed: def f() -> Unknown
+
+def f(x: int) -> int:
+    raise NotImplementedError
+
+reveal_type(f)  # revealed: def f(x: int) -> int
+
+f: int = 1
+reveal_type(f)  # revealed: Literal[1]
+
+def f(): ...
+
+reveal_type(f)  # revealed: def f() -> Unknown
+```

crates/ty_python_semantic/resources/mdtest/shadowing/variable_declaration.md

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+# Shadwing declaration
+
+## Shadow after incompatible declarations is OK
+
+```py
+def _(flag: bool):
+    if flag:
+        x: str
+    else:
+        x: int
+
+    x: bytes = b"foo"
+```