Fix doc tests

Author: smoelius

clippy_lints_internal/src/derive_deserialize_allowing_unknown.rs

@@ -26,7 +26,7 @@ declare_tool_lint! {
     ///
     /// ### Example
     /// ```rust
-    /// #[derive(Deserialize)]
+    /// #[derive(serde::Deserialize)]
     /// pub struct DisallowedPath {
     ///     path: String,
     ///     reason: Option<String>,
@@ -36,7 +36,7 @@ declare_tool_lint! {
     ///
     /// Use instead:
     /// ```rust
-    /// #[derive(Deserialize)]
+    /// #[derive(serde::Deserialize)]
     /// #[serde(deny_unknown_fields)]
     /// pub struct DisallowedPath {
     ///     path: String,