Mistakes in documentation in fundamentals chapter using webpack

**I'm submitting a bug report**
* **Language:**
all

**Current behavior:**
The documentation [here](https://aurelia.io/docs/fundamentals/app-configuration-and-startup#bootstrapping-older-browsers) has mistakes. Check the _Manual Bootstrapping with Webpack_ code section, as reported [here](https://discourse.aurelia.io/t/problem-with-manual-bootstrapping/1599/2).

Start with the Manual Bootstrapping with Webpack section at the linked fundamentals documentation page, then read the linked Discourse report to identify the mistakes. Update the documentation so the code section matches the intended manual bootstrapping behavior, and verify the corrected examples are consistent with the report.

Written by the indexing model from the issue text.