Fix typos (#39)

src/lib.rs

@@ -1,8 +1,8 @@
 //! serde-env will allow deserializing env into structs.
 //!
 //! The biggest different between [envy](https://github.com/softprops/envy) is
-//! serde-env supports deserialize `_` seperated env into nests structs. That means
-//! we will treat env as `_` seperated tree instead of a flat map.
+//! serde-env supports deserialize `_` separated env into nests structs. That means
+//! we will treat env as `_` separated tree instead of a flat map.
 //!
 //! For examples:
 //!

src/value.rs

@@ -6,7 +6,7 @@ use crate::cond_log::trace;
 
 /// Node represents a tree of env values.
 ///
-/// Every env will be seperated by `_` in key to construct this tree.
+/// Every env will be separated by `_` in key to construct this tree.
 ///
 /// - `ABC=123` => `Node("123", {})`
 /// - `ABC_DEF=123` => `Node("", { "DEF": Node("123", {}) })`