fix(docs): better description and formatting keywords

docs/errors/E0719.md

@@ -1,14 +1,14 @@
 # E0719: unexpected 'await' keyword on function declaration
 
-For defining asynchronous functions, you need to explicitly annotate a
-function with `async` keyword, not `await`.
+If you meant to define an asynchronous function, you need to explicitly annotate
+the function with `async` keyword, not `await`.
 
 ```javascript
-await function f() {};
+await function f() {}
 ```
 
-To fix this warning, simply replace 'await' by 'async'. Now, you have an
-asynchronous and you're able to use 'await' inside this function.
+To fix this warning, simply replace `await` by `async`. Now, you have an
+asynchronous function and you're able to use `await` inside it.
 
 ```javascript
 async function f() {}