Fix diagram

Author: Marko Mikulicic

src/ast.rs

@@ -11,13 +11,11 @@ use serde_json::Value;
 /// For example, the JSONPath `$.foo.bar` yields this AST:
 ///
 /// ```text
-///               ^
-///              / \
-///             ^   \___ DotName("bar")
-///            / \
-///           ^   \___ DotName("foo")
-///          /
-/// Root ___/
+///              ^
+///             / \
+///            ^   \___ DotName("bar")
+///           / \
+/// Root ___ /   \___ DotName("foo")
 /// ```
 ///
 /// A more complicated example: `$.foo[1,2]["bar"]`: