Add a bit more docs to the ADB module

pwnlib/adb/adb.py

@@ -10,12 +10,38 @@
 over the devices.
 
 First and most important is the ``context.device`` property, which declares the "currently"
-seelcted device in any scope.  It can be set manually to a serial number, or to a ``Device``
+selected device in any scope.  It can be set manually to a serial number, or to a ``Device``
 instance.
 
 .. code-block:: python
 
-    >>> context.device = ''
+    # Take the first available device
+    context.device = adb.wait_for_device()
+
+    # Set a device by serial number
+    context.device = 'ZX1G22LH8S'
+
+    # Set a device by its product name
+    for device in adb.devices():
+        if device.product == 'shamu':
+            break
+    else:
+        error("Could not find any shamus!")
+
+Once a device is selected, you can operate on it with any of the functions in
+the ``pwnlib.adb`` module.
+
+.. code-block:: python
+
+    # Get a process listing
+    print adb.process(['ps']).recvall()
+
+    # Fetch properties
+    print adb.properties.ro.build.fingerprint
+
+    # Read and write files
+    print adb.read('/proc/version')
+    adb.write('/data/local/tmp/foo', 'my data')
 
 """
 import functools