Move parsing files around (#4626)

Signed-off-by: Nick Cameron <nrc@ncameron.org>

src/wasm-lib/derive-docs/tests/doc_comment_with_code.gen

@@ -150,7 +150,7 @@ impl crate::docs::StdLibFn for MyFunc {
             .iter()
             .map(|cb| {
                 let program = crate::Program::parse(cb).unwrap();
-                let mut options: crate::ast::types::FormatOptions = Default::default();
+                let mut options: crate::parsing::ast::types::FormatOptions = Default::default();
                 options.insert_final_newline = false;
                 program.ast.recast(&options, 0)
             })