Merge pull request rust-cli#481 from ijackson/warning

Fix docs warnings

src/env.rs

@@ -41,7 +41,7 @@ pub struct Environment {
     /// Optional character sequence that separates each env value into a vector. only works when try_parsing is set to true
     /// Once set, you cannot have type String on the same environment, unless you set list_parse_keys.
     list_separator: Option<String>,
-    /// A list of keys which should always be parsed as a list. If not set you can have only Vec<String> or String (not both) in one environment.
+    /// A list of keys which should always be parsed as a list. If not set you can have only `Vec<String>` or `String` (not both) in one environment.
     list_parse_keys: Option<Vec<String>>,
 
     /// Ignore empty env values (treat as unset).
@@ -142,7 +142,9 @@ impl Environment {
     }
 
     /// When set and try_parsing is true, then all environment variables will be parsed as [`Vec<String>`] instead of [`String`].
-    /// See [`with_list_parse_key`] when you want to use [`Vec<String>`] in combination with [`String`].
+    /// See
+    /// [`with_list_parse_key`](Self::with_list_parse_key)
+    /// when you want to use [`Vec<String>`] in combination with [`String`].
     pub fn list_separator(mut self, s: &str) -> Self {
         self.list_separator = Some(s.into());
         self