Windows Registry: Update docstrings + exceptions

This updates the docstrings on several methods to indicate that they may
raise an exception.

volatility3/framework/symbols/windows/extensions/registry.py

@@ -159,6 +159,11 @@ class CM_KEY_NODE(objects.StructType):
     """Extension to allow traversal of registry keys."""
 
     def get_volatile(self) -> bool:
+        """
+        Returns a bool indicating whether or not the key is volatile.
+
+        Raises ValueError if the key was not instantiated on a RegistryHive layer
+        """
         if not isinstance(self._context.layers[self.vol.layer_name], RegistryHive):
             raise ValueError(
                 "Cannot determine volatility of registry key without an offset in a RegistryHive layer"
@@ -166,7 +171,10 @@ class CM_KEY_NODE(objects.StructType):
         return bool(self.vol.offset & 0x80000000)
 
     def get_subkeys(self) -> Iterator["CM_KEY_NODE"]:
-        """Returns a list of the key nodes."""
+        """Returns a list of the key nodes.
+
+        Raises TypeError if the key was not instantiated on a RegistryHive layer
+        """
         hive = self._context.layers[self.vol.layer_name]
         if not isinstance(hive, RegistryHive):
             raise TypeError("CM_KEY_NODE was not instantiated on a RegistryHive layer")
@@ -222,7 +230,10 @@ class CM_KEY_NODE(objects.StructType):
                     yield from self._get_subkeys_recursive(hive, subnode)
 
     def get_values(self) -> Iterator["CM_KEY_VALUE"]:
-        """Returns a list of the Value nodes for a key."""
+        """Returns a list of the Value nodes for a key.
+
+        Raises TypeError if the key was not instantiated on a RegistryHive layer
+        """
         hive = self._context.layers[self.vol.layer_name]
         if not isinstance(hive, RegistryHive):
             raise TypeError("CM_KEY_NODE was not instantiated on a RegistryHive layer")
@@ -251,6 +262,11 @@ class CM_KEY_NODE(objects.StructType):
         return self.Name.cast("string", max_length=namelength, encoding="latin-1")
 
     def get_key_path(self) -> str:
+        """
+        Returns the full path to this registry key.
+
+        Raises TypeError if the key was not instantiated on a RegistryHive layer
+        """
         reg = self._context.layers[self.vol.layer_name]
         if not isinstance(reg, RegistryHive):
             raise TypeError("Key was not instantiated on a RegistryHive layer")