docstring and comment about get() vs _missing_()

volatility/framework/symbols/windows/extensions/registry.py

@@ -26,13 +26,16 @@ class RegValueTypes(enum.Enum):
     REG_QWORD = 11
     REG_UNKNOWN = 99999
 
-    # TODO: Uncomment once we target python-3.6
+    # TODO: This _missing_() method can replace the get() method below
+    # if support for Python 3.6 is added in the future
     # @classmethod
     # def _missing_(cls, value):
     #     return cls(RegValueTypes.REG_UNKNOWN)
 
     @classmethod
     def get(cls, value):
+        """An alternative method for using this enum when the value may be unknown.
+        This is used to support unknown value requests in Python <3.6."""
         try:
             return cls(value)
         except ValueError: