Fix typo and deprecation message (resolves [ci skip]
@@ -286,7 +286,7 @@ class Errors(object):
"setting don't overlap.")
E104 = ("Can't find JSON schema for '{name}'.")
E105 = ("The Doc.print_tree() method is now deprecated. Please use "
- "Doc.json() instead.")
+ "Doc.to_json() instead or write your own function.")
E106 = ("Can't find doc._.{attr} attribute specified in the underscore "
"settings: {opts}")
E107 = ("Value of doc._.{attr} is not JSON-serializable: {value}")
