fix example and mention that the compiler checks c"" literals

Author: y21

clippy_lints/src/methods/mod.rs

@@ -3758,18 +3758,19 @@ declare_clippy_lint! {
     /// Checks for calls to `CString::new` and `CStr::from_bytes_with_nul` with byte string literals as arguments.
     ///
     /// ### Why is this bad?
-    /// This can be written more concisely using `c"str"` literals.
+    /// This can be written more concisely using `c"str"` literals and is also less error-prone,
+    /// because the compiler checks for interior nul bytes.
     ///
     /// ### Example
     /// ```no_run
     /// # use std::ffi::CStr;
-    /// # fn needs_cstr(_: &str) {}
+    /// # fn needs_cstr(_: &CStr) {}
     /// needs_cstr(CStr::from_bytes_with_nul(b":)").unwrap());
     /// ```
     /// Use instead:
     /// ```no_run
     /// # use std::ffi::CStr;
-    /// # fn needs_cstr(_: &str) {}
+    /// # fn needs_cstr(_: &CStr) {}
     /// needs_cstr(c":)");
     /// ```
     #[clippy::version = "1.76.0"]