doc updates

Author: jchanvfx

docs/examples/ex_node.rst

@@ -11,7 +11,8 @@ Creating Nodes
     :linenos:
     :emphasize-lines: 22
 
-    from NodeGraphQt import BaseNode, NodeGraph, QtWidgets
+    from Qt import QtWidgets
+    from NodeGraphQt import BaseNode, NodeGraph
 
     class MyNode(BaseNode):
 
@@ -89,7 +90,8 @@ Here's an example to embed a custom widget where we subclass the
     :linenos:
     :emphasize-lines: 38, 96, 97
 
-    from Qt import QtCore, QtWidgets, BaseNode, NodeBaseWidget
+    from Qt import QtCore, QtWidgets
+    from NodeGraphQt import BaseNode, NodeBaseWidget
 
     class MyCustomWidget(QtWidgets.QWidget):
         """

docs/examples/ex_overview.rst

@@ -64,7 +64,7 @@ Here's a basic example snippet for creating two nodes and connecting them togeth
 
     import sys
 
-    from NodeGraphQt import QtWidgets
+    from Qt import QtWidgets
     from NodeGraphQt import NodeGraph, BaseNode, setup_context_menu