more guide

guide/src/qs_2.md

@@ -27,7 +27,7 @@ actix-web = { git = "https://github.com/actix/actix-web" }
 In order to implement a web server, first we need to create a request handler.
 
 A request handler is a function that accepts a `HttpRequest` instance as its only parameter 
-and returns a `HttpResponse` instance or actor that uses `HttpContext` as an actor's context::
+and returns a type that can be converted into `HttpResponse`:
 
 ```rust,ignore
 extern crate actix_web;

guide/src/qs_3.md

@@ -71,8 +71,33 @@ fn main() {
 
 ## Handler
 
-A request handler can have several different forms. Simple function
-that accepts `HttpRequest` and returns `HttpResponse` or any type that can be converted
-into `HttpResponse`. Function that that accepts `HttpRequest` and 
-returns `Stream<Item=Frame, Error=Error>`. Or http actor, i.e. actor that has `HttpContext<A>`
-as a context.
+A request handler can have several different forms. 
+
+* Simple function that accepts `HttpRequest` and returns `HttpResponse` or any 
+   type that can be converted into `HttpResponse`. 
+* Function that that accepts `HttpRequest` and returns `Stream<Item=Frame, Error=Error>`. 
+* Http actor, i.e. actor that has `HttpContext<A>`as a context. 
+
+Actix provides response conversion for some standard types, like `&'static str`, `String`, etc.
+For complete list of implementations check 
+[HttpResponse documentation](../actix_web/struct.HttpResponse.html#implementations).
+
+Examples:
+
+```rust,ignore
+fn index(req: HttpRequest) -> &'static str {
+    "Hello world!"
+}
+```
+
+```rust,ignore
+fn index(req: HttpRequest) -> String {
+    "Hello world!".to_owned()
+}
+```
+
+```rust,ignore
+fn index(req: HttpRequest) -> Bytes {
+    Bytes::from_static("Hello world!")
+}
+```