Tweaks to Errors chapter.

guide/src/qs_4_5.md

@@ -1,10 +1,11 @@
 # Errors
 
-Actix uses [`Error` type](../actix_web/error/struct.Error.html)
+Actix uses the [`Error` type](../actix_web/error/struct.Error.html)
 and [`ResponseError` trait](../actix_web/error/trait.ResponseError.html)
 for handling handler's errors.
+
 Any error that implements the `ResponseError` trait can be returned as an error value.
-*Handler* can return an *Result* object; actix by default provides
+`Handler` can return an `Result` object. By default, actix provides a
 `Responder` implementation for compatible result types. Here is the implementation
 definition:
 
@@ -12,7 +13,8 @@ definition:
 impl<T: Responder, E: Into<Error>> Responder for Result<T, E>
 ```
 
-And any error that implements `ResponseError` can be converted into an `Error` object.
+Any error that implements `ResponseError` can be converted into an `Error` object.
+
 For example, if the *handler* function returns `io::Error`, it would be converted
 into an `HttpInternalServerError` response. Implementation for `io::Error` is provided
 by default.
@@ -35,7 +37,7 @@ fn index(req: HttpRequest) -> io::Result<fs::NamedFile> {
 
 ## Custom error response
 
-To add support for custom errors, all we need to do is just implement the `ResponseError` trait
+To add support for custom errors, all we need to do is implement the `ResponseError` trait
 for the custom error type. The `ResponseError` trait has a default implementation
 for the `error_response()` method: it generates a *500* response.
 
@@ -109,7 +111,7 @@ fn index(req: HttpRequest) -> Result<&'static str, MyError> {
 ## Error helpers
 
 Actix provides a set of error helper types. It is possible to use them for generating
-specific error responses. We can use helper types for the first example with custom error.
+specific error responses. We can use the helper types for the first example with a custom error.
 
 ```rust
 # extern crate actix_web;