Add a bit more documentation to context.rst

docs/source/context.rst

@@ -8,6 +8,27 @@
 :mod:`pwnlib.context` --- Setting runtime variables
 =====================================================
 
+Many settings in ``pwntools`` are controlled via the global variable :data:`.context, such as the selected target operating system, architecture, and bit-width.
+
+In general, exploits will start with something like:
+
+.. code-block:: python
+
+    from pwn import *
+    context.arch = 'amd64'
+
+Which sets up everything in the exploit for exploiting a 64-bit Intel binary.
+
+The recommended method is to use ``context.binary``  to automagically set all of the appropriate values.
+
+.. code-block:: python
+
+    from pwn import *
+    context.binary = './challenge-binary'
+
+Module Members
+=====================================================
+
 .. autodata:: pwnlib.context.context
 
 .. autoclass:: pwnlib.context.ContextType