fix spelling on lexical lifetimes page

src/rust-2018/ownership-and-lifetimes/non-lexical-lifetimes.md

@@ -3,7 +3,7 @@
 ![Minimum Rust version: beta](https://img.shields.io/badge/Minimum%20Rust%20Version-beta-orange.svg)
 
 The borrow checker has been enhanced to accept more code, via a mechanism
-called "non-lexial lifetimes." Consider this example:
+called "non-lexical lifetimes." Consider this example:
 
 ```rust,ignore
 fn main() {
@@ -64,7 +64,7 @@ error[E0502]: cannot borrow `x` as mutable because it is also borrowed as immuta
   | - immutable borrow ends here
 ```
 
-With non-lexial lifetime, the error changes slightly:
+With non-lexical lifetimes, the error changes slightly:
 
 ```text
 error[E0502]: cannot borrow `x` as mutable because it is also borrowed as immutable
@@ -79,5 +79,5 @@ error[E0502]: cannot borrow `x` as mutable because it is also borrowed as immuta
   |                       - borrow later used here
 ```
 
-instead of pointing to where `y` goes out of scope, it insteads shows you where
-the conflicting borrow occurs. This makes these sorts of errors *far* easier to debug.
+Instead of pointing to where `y` goes out of scope, it shows you where
+the conflicting borrow occurs. This makes these sorts of errors *far* easier to debug.