[DOC] adapt documentation to env changes

part of #430

src/component/component.ts

@@ -136,7 +136,7 @@ export class Component<T extends Env, Props extends {}> {
       if (!this.env.qweb) {
         this.env.qweb = new QWeb();
       }
-      this.props = undefined as unknown as Props;
+      this.props = (undefined as unknown) as Props;
       this.env.qweb.on("update", this, () => {
         if (this.__owl__.isMounted) {
           this.render(true);

src/config.ts

@@ -19,7 +19,7 @@ Object.defineProperty(config, "mode", {
   set(mode: string) {
     QWeb.dev = mode === "dev";
     if (QWeb.dev) {
-      const url = `https://github.com/odoo/owl/blob/master/doc/tooling.md#development-mode`;
+      const url = `https://github.com/odoo/owl/blob/master/doc/reference/config.md#mode`;
       console.warn(
         `Owl is running in 'dev' mode.  This is not suitable for production use. See ${url} for more information.`
       );