added missing DataTreeNode

Author: forman

docs/config.md

@@ -59,7 +59,7 @@ def export_config():
 
 ## Configuration Objects
 
-Each configuration object contains all of the information XRLint needs 
+Each configuration object contains all the information XRLint needs 
 to execute on a set of files. Each configuration object is made up of 
 these properties:
 

docs/start.md

@@ -27,15 +27,15 @@ Initializing a new project with
 xrlint --init
 ```
 
-writes a configuration file `xrlint.config.yaml` 
+writes a configuration file `xrlint_config.yaml` 
 into the current working directory:
 
 ```yaml
 - recommended
 ```
 
 This configuration file tells XRLint to use the predefined configuration
-named `recommeded`.  
+named `recommended`.  
 
 Create a dataset to test XRLint: