Update crates/red_knot_python_semantic/resources/mdtest/assignment/au…

…gmented.md

Co-authored-by: Alex Waygood <[email protected]>

crates/red_knot_python_semantic/resources/mdtest/assignment/augmented.md

@@ -86,7 +86,7 @@ f += "Hello, world!"
 reveal_type(f)  # revealed: int
 ```
 
-## Partially-bound with `__add__`
+## Partially bound with `__add__`
 
 ```py
 def bool_instance() -> bool: