closes#1818
Previously, the markdown of some chapters was converted to Jade markup
to support the conditional exclusion of TS prose parts in Dart
chapters. This commit reverts some of that back to clean markdown,
thanks to a few custom directives.
* docs(toh-6/ts): minor edits and enhancements
Changes to prose:
- Complete TODO item of displaying `heroes.component` errors.
- Mainly copyedits.
- Add of blocks statements so that prose can be used on Dart side.
- Show excerpt and briefly explain of changes (previously missing):
- `app/hero-detail.component.html`
- `app/heroes.component.ts` error handling
- Add missing file to changed/added files listing and makeTabs
- `toh-6/ts/app/in-memory-data.service.ts,
- `toh-6/ts/sample.css`
Code changes:
- Mainly copyedits
- Renamed `heroes.component.ts` `delete` to `deleteHero` to match
naming of other methods
* remove unnecessary change relative to toh-5