Fix use of nonstandard "casted"

Author: ehuss

src/expressions/operator-expr.md

@@ -549,7 +549,7 @@ reference types and `mut` or `const` in pointer types.
 [^lessmut]: Only when `m₁` is `mut` or `m₂` is `const`. Casting `mut` reference/pointer to
 `const` pointer is allowed.
 
-[^no-capture]: Only closures that do not capture (close over) any local variables can be casted to function pointers.
+[^no-capture]: Only closures that do not capture (close over) any local variables can be cast to function pointers.
 
 ### Semantics
 

src/items/enumerations.md

@@ -241,7 +241,7 @@ assert_eq!(2, Enum::Baz as isize);
 ```
 
 r[items.enum.discriminant.coercion.fieldless]
-[Field-less enums] can be casted if they do not have explicit discriminants, or where only unit variants are explicit.
+[Field-less enums] can be cast if they do not have explicit discriminants, or where only unit variants are explicit.
 
 ```rust
 enum Fieldless {

src/items/traits.md

@@ -173,7 +173,7 @@ trait DynIncompatible {
     fn foo() {}  // ERROR: associated function without Sized
     fn returns(&self) -> Self; // ERROR: Self in return type
     fn typed<T>(&self, x: T) {} // ERROR: has generic type parameters
-    fn nested(self: Rc<Box<Self>>) {} // ERROR: nested receiver cannot be downcasted
+    fn nested(self: Rc<Box<Self>>) {} // ERROR: nested receiver cannot be dispatched on
 }
 
 struct S;