Ran cargo dev update_lints

Author: theo-lw

src/lintlist/mod.rs

@@ -1147,7 +1147,7 @@ pub static ref ALL_LINTS: Vec<Lint> = vec![
     Lint {
         name: "map_identity",
         group: "style",
-        desc: "default lint description",
+        desc: "using iterator.map(|x| x)",
         deprecation: None,
         module: "map_identity",
     },