Simplify example instructions and fix broken examples

Also convert to AsciiDoc while we're at it.

examples/chunked_hello_world/README.asciidoc

@@ -1,27 +1,19 @@
-Chunked hello world example
-===========================
+= Chunked hello world example
 
 To try this example, you need GNU `make` and `git` in your PATH.
 
-To build the example, run the following command:
+To build and run the example, use the following command:
 
-``` bash
-$ make
-```
+[source,bash]
+$ make run
 
-To start the release in the foreground:
-
-``` bash
-$ ./_rel/chunked_hello_world_example/bin/chunked_hello_world_example console
-```
-
-Then point your browser at [http://localhost:8080](http://localhost:8080),
+Then point your browser to http://localhost:8080
 or use `curl` to see the chunks arriving one at a time every second.
 
-Example output
---------------
+== Example output
 
-``` bash
+[source,bash]
+----
 $ time curl -i http://localhost:8080
 HTTP/1.1 200 OK
 transfer-encoding: chunked
@@ -33,4 +25,4 @@ Hello
 World
 Chunked!
 curl -i http://localhost:8080  0.01s user 0.00s system 0% cpu 2.015 total
-```
+----