Improve code and tests readability

src/settings/mod.rs

@@ -262,8 +262,10 @@ impl Settings {
     /// # Example
     ///
     /// ```
+    /// # use lang_evolve_core::settings::Settings;
     /// use std::path::Path;
-    /// let s = lang_evolve_core::settings::Settings::new();
+    ///
+    /// let s = Settings::new();
     ///
     /// // Export to JSON
     /// let path_json = Path::new("./output.json");
@@ -303,14 +305,14 @@ impl Settings {
         let rules = self.rules.clone();
         let rules: Vec<Rule> = rules
             .iter()
-            .map(|x| x.update(&self.categories).unwrap())
+            .map(|rule| rule.update(&self.categories).unwrap())
             .collect();
         Ok(rules)
     }
 
     /// Apply list of rules to input
     ///
-    /// The list of rules in the struct will be applied to the input `s`. If the
+    /// The list of rules in the struct will be applied to the input `new`. If the
     /// rule contains the `%` character followed by a capital letter, this marks
     /// a category of phonemes and should be replaced by them. For instance, we
     /// have:
@@ -320,7 +322,7 @@ impl Settings {
     ///
     /// # Arguments
     ///
-    /// * `s` - Input to modify
+    /// * `new` - Input to modify
     ///
     /// # Example
     ///
@@ -328,8 +330,8 @@ impl Settings {
     /// # use lang_evolve_core::settings::Settings;
     /// let settings = Settings::new();
     /// // add some rules...
-    /// let input = String::new();
     /// // set some input
+    /// let input = String::new();
     /// let _output = settings.apply(input);
     /// ```
     pub fn apply(&self, s: String) -> std::result::Result<String, String> {