refactor: rename DTree to DValue

site/doc/pages/markdown_to_ast.txt

@@ -1,21 +1,21 @@
 :sig
-DTree markdown_to_ast(String src)
-DTree markdown_to_ast(String src, DTree options)
+DValue markdown_to_ast(String src)
+DValue markdown_to_ast(String src, DValue options)
 
 :params
 src : markdown source text
 options : optional markdown options tree
-return value : a `DTree` document AST
+return value : a `DValue` document AST
 
 :see
 markdown_to_html
 component
 component_render
 json_encode
-0_DTree
+0_DValue
 
 :content
-Parses Markdown source into a structured `DTree` document tree.
+Parses Markdown source into a structured `DValue` document tree.
 
 The parser targets a practical GitHub-flavored subset by default:
 
@@ -67,8 +67,8 @@ Common inline nodes:
 Example:
 
 ```uce
-DTree options = json_decode("{\"components\":{\":::warning\":\"components/markdown/warning\"}}");
-DTree ast = markdown_to_ast(file_get_contents("README.md"), options);
+DValue options = json_decode("{\"components\":{\":::warning\":\"components/markdown/warning\"}}");
+DValue ast = markdown_to_ast(file_get_contents("README.md"), options);
 print(json_encode(ast));
 ```