update lints

Author: PunitLodha

src/lintlist/mod.rs

@@ -2247,7 +2247,7 @@ vec![
     Lint {
         name: "str_to_string",
         group: "restriction",
-        desc: "using `to_string()` on a str, which should be `to_owned()`",
+        desc: "using `to_string()` on a `&str`, which should be `to_owned()`",
         deprecation: None,
         module: "str_to_string",
     },
@@ -2289,7 +2289,7 @@ vec![
     Lint {
         name: "string_to_string",
         group: "restriction",
-        desc: "using `to_string()` on a String, which should be `clone()`",
+        desc: "using `to_string()` on a `String`, which should be `clone()`",
         deprecation: None,
         module: "string_to_string",
     },