[red-knot] Format mdtest Python snippets more concisely (#13905)

crates/red_knot_python_semantic/resources/mdtest/binary/instances.md

@@ -53,10 +53,8 @@ class A:
     def __or__(self, other) -> A:
         return self
 
-
 class B: ...
 
-
 reveal_type(A() + B())  # revealed: A
 reveal_type(A() - B())  # revealed: A
 reveal_type(A() * B())  # revealed: A
@@ -117,10 +115,8 @@ class A:
     def __ror__(self, other) -> A:
         return self
 
-
 class B: ...
 
-
 reveal_type(B() + A())  # revealed: A
 reveal_type(B() - A())  # revealed: A
 reveal_type(B() * A())  # revealed: A
@@ -148,10 +144,8 @@ class A:
     def __rsub__(self, other) -> int:
         return 1
 
-
 class B: ...
 
-
 reveal_type(A() + B())  # revealed: int
 reveal_type(B() - A())  # revealed: int
 ```
@@ -167,15 +161,12 @@ class A:
     def __add__(self, other: B) -> int:
         return 42
 
-
 class B:
     def __radd__(self, other: A) -> str:
         return "foo"
 
-
 reveal_type(A() + B())  # revealed:  int
 
-
 # Edge case: C is a subtype of C, *but* if the two sides are of *equal* types,
 # the lhs *still* takes precedence
 class C:
@@ -185,7 +176,6 @@ class C:
     def __radd__(self, other: C) -> str:
         return "foo"
 
-
 reveal_type(C() + C())  # revealed: int
 ```
 
@@ -203,22 +193,17 @@ class A:
     def __radd__(self, other) -> str:
         return "foo"
 
-
 class MyString(str): ...
 
-
 class B(A):
     def __radd__(self, other) -> MyString:
         return MyString()
 
-
 reveal_type(A() + B())  # revealed: MyString
 
-
 # N.B. Still a subtype of `A`, even though `A` does not appear directly in the class's `__bases__`
 class C(B): ...
 
-
 # TODO: we currently only understand direct subclasses as subtypes of the superclass.
 # We need to iterate through the full MRO rather than just the class's bases;
 # if we do, we'll understand `C` as a subtype of `A`, and correctly understand this as being
@@ -240,10 +225,8 @@ class A:
     def __radd__(self, other) -> int:
         return 42
 
-
 class B(A): ...
 
-
 reveal_type(A() + B())  # revealed: str
 ```
 
@@ -266,12 +249,10 @@ class A:
     def __sub__(self, other: A) -> A:
         return A()
 
-
 class B:
     def __rsub__(self, other: A) -> B:
         return B()
 
-
 # TODO: this should be `B` (the return annotation of `B.__rsub__`),
 # because `A.__sub__` is annotated as only accepting `A`,
 # but `B.__rsub__` will accept `A`.
@@ -287,11 +268,9 @@ class A:
     def __call__(self, other) -> int:
         return 42
 
-
 class B:
     __add__ = A()
 
-
 reveal_type(B() + B())  # revealed: int
 ```
 
@@ -311,15 +290,12 @@ reveal_type(42 + 4.2)  # revealed: int
 # TODO should be complex, need to check arg type and fall back to `rhs.__radd__`
 reveal_type(3 + 3j)  # revealed: int
 
-
 def returns_int() -> int:
     return 42
 
-
 def returns_bool() -> bool:
     return True
 
-
 x = returns_bool()
 y = returns_int()
 
@@ -343,7 +319,6 @@ class A:
     def __radd__(self, other) -> A:
         return self
 
-
 reveal_type(A() + 1)  # revealed: A
 # TODO should be `A` since `int.__add__` doesn't support `A` instances
 reveal_type(1 + A())  # revealed: int
@@ -388,15 +363,12 @@ from does_not_exist import Foo  # error: [unresolved-import]
 
 reveal_type(Foo)  # revealed: Unknown
 
-
 class X:
     def __add__(self, other: object) -> int:
         return 42
 
-
 class Y(Foo): ...
 
-
 # TODO: Should be `int | Unknown`; see above discussion.
 reveal_type(X() + Y())  # revealed: int
 ```
@@ -411,12 +383,10 @@ The magic method must exist on the class, not just on the instance:
 def add_impl(self, other) -> int:
     return 1
 
-
 class A:
     def __init__(self):
         self.__add__ = add_impl
 
-
 # error: [unsupported-operator] "Operator `+` is unsupported between objects of type `A` and `A`"
 # revealed: Unknown
 reveal_type(A() + A())
@@ -427,7 +397,6 @@ reveal_type(A() + A())
 ```py
 class A: ...
 
-
 # error: [unsupported-operator]
 # revealed: Unknown
 reveal_type(A() + A())
@@ -441,14 +410,11 @@ A left-hand dunder method doesn't apply for the right-hand operand, or vice vers
 class A:
     def __add__(self, other) -> int: ...
 
-
 class B:
     def __radd__(self, other) -> int: ...
 
-
 class C: ...
 
-
 # error: [unsupported-operator]
 # revealed: Unknown
 reveal_type(C() + A())
@@ -471,7 +437,6 @@ class Foo:
     def __radd__(self, other: Foo) -> Foo:
         return self
 
-
 # error: [unsupported-operator]
 # revealed: Unknown
 reveal_type(Foo() + Foo())