Update docs/docs/reference/metaprogramming/macros.md

Co-authored-by: Nicolas Stucki <nicolas.stucki@gmail.com>

Author: blast-hardcheese

docs/docs/reference/metaprogramming/macros.md

@@ -197,7 +197,7 @@ def to[T, R](f: Expr[T] => Expr[R])(using t: Type[T])(using Type[R], Quotes): Ex
 ```
 
 In this version of `to`, the type of `x` is now the result of
-inserting the type `Type[T]` and selecting its `Underlying `.
+inserting the type `Type[T]` and selecting its `Underlying`.
 
 To avoid clutter, the compiler converts any type reference to
 a type `T` in subsequent phases to `summon[Type[T]].Underlying`.