Fix example

Author: Noratrieb

clippy_lints/src/casts/mod.rs

@@ -608,13 +608,13 @@ declare_clippy_lint! {
     /// ### Example
     /// ```rust
     /// let string = String::with_capacity(1);
-    /// let ptr = string.as_ptr() as *mut _;
+    /// let ptr = string.as_ptr() as *mut u8;
     /// unsafe { ptr.write(4) }; // UNDEFINED BEHAVIOUR
     /// ```
     /// Use instead:
     /// ```rust
     /// let mut string = String::with_capacity(1);
-    /// let string = string.as_mut_ptr();
+    /// let ptr = string.as_mut_ptr();
     /// unsafe { ptr.write(4) };
     /// ```
     #[clippy::version = "1.66.0"]

src/docs/as_ptr_cast_mut.txt

@@ -8,12 +8,12 @@ mutability is used, making it unlikely that having it as a mutable pointer is co
 ### Example
 ```
 let string = String::with_capacity(1);
-let ptr = string.as_ptr() as *mut _;
+let ptr = string.as_ptr() as *mut u8;
 unsafe { ptr.write(4) }; // UNDEFINED BEHAVIOUR
 ```
 Use instead:
 ```
 let mut string = String::with_capacity(1);
-let string = string.as_mut_ptr();
+let ptr = string.as_mut_ptr();
 unsafe { ptr.write(4) };
 ```