Merge pull request #8 from dbuenzli/fix-model-type

Fix type of model property (closes #7).

Author: glikely

source/devicetree-basics.rst

@@ -481,7 +481,7 @@ model
 
 Property name: ``model``
 
-Value type: ``<stringlist>``
+Value type: ``<string>``
 
 Description: