- fix for typo and clarification to documentation

Previous example were slightly ambiguous, by adding 'fixed' NodePath tree
to compare and one more example it will be easier to understand for
future generation of developers.

doc/base/classes.xml

@@ -14261,7 +14261,21 @@
 			<argument index="0" name="path" type="NodePath">
 			</argument>
 			<description>
-			Fetch a node. "path" must be valid (or else error will occur) and can be either the name of a child node, a relative path (from the current node to another node), or an absolute path to a node.[br] Examples ofa paths are: get_node("Sword") , get_node("../Swamp/Alligator") , get_node("/MyGame"). [br]Note: fetching absolute paths only works when the node is inside the scene tree (see [method is_inside_scene]).
+                Fetch a node. NodePath must be valid (or else error will occur) and can be either the path to child node, a relative path (from the current node to another node), or an absolute path to a node.[br] Note: fetching absolute paths only works when the node is inside the scene tree (see [method is_inside_scene]). Examples. Assume your current node is Character and following tree:[br]
+    root/[br]
+    root/Character[br]
+    root/Character/Sword[br]
+    root/Character/Backpack/Dagger[br]
+    root/MyGame[br]
+    root/Swamp/Alligator[br]
+    root/Swamp/Mosquito[br]
+    root/Swamp/Goblin[br]
+[br]
+    Possible paths are:[br]
+    - get_node("Sword")[br]
+    - get_node("Backpack/Dagger")[br]
+    - get_node("../Swamp/Alligator")[br]
+    - get_node("/root/MyGame")[br]
 			</description>
 		</method>
 		<method name="get_parent" qualifiers="const" >