Documentation: Clarify that the code is just an example

Clarifies for #773 and #776

doc/source/simple-plugin.rst

@@ -6,6 +6,12 @@ This guide will step through how to construct a simple plugin using Volatility 3
 The example plugin we'll use is :py:class:`~volatility3.plugins.windows.dlllist.DllList`, which features the main traits
 of a normal plugin, and reuses other plugins appropriately.
 
+.. note::
+
+    This document will not include the complete code necessary for a
+    working plugin (such as imports, etc) since it's designed to focus on the necessary componets for writing a plugin.
+    For complete and functioning plugins, the ``framework/plugins`` directory should be consulted.
+
 Inherit from PluginInterface
 ----------------------------