docs: named examples in README

README.rst

@@ -98,6 +98,9 @@ Installation
 Examples
 --------
 
+Hello World
+...........
+
 A very simple application with one command:
 
 .. code-block:: python
@@ -116,6 +119,9 @@ Run it:
     $ ./app.py
     Hello world
 
+Type Annotations
+................
+
 Type annotations are used to infer argument types:
 
 .. code-block:: python
@@ -133,6 +139,9 @@ annotation):
     $ ./app.py 1 2 3
     6
 
+Multiple Commands
+.................
+
 An app with multiple commands:
 
 .. code-block:: python
@@ -150,6 +159,9 @@ Run it:
     $ ./app.py echo Hey
     Hey
 
+Modularity
+..........
+
 A potentially modular application with more control over the process:
 
 .. code-block:: python
@@ -212,6 +224,9 @@ to CLI arguments)::
 
 (The help messages have been simplified a bit for brevity.)
 
+Decorators
+..........
+
 `Argh` easily maps plain Python functions to CLI.  Sometimes this is not
 enough; in these cases the powerful API of `argparse` is also available: