docs: getting started guide, malformed json example (#1605)

[espresso]

docs: getting started guide, malformed json example (#1605)

Fixes #1605 Added missing bracket to JSON example within Getting Started > Manual Installation guide

Please read and mark the following check list before creating a pull request:

• [X] I read and followed the CONTRIBUTING.md guide.
• [X] I read and followed the New Feature Checklist guide.

Short description of what this resolves:

Adds a missing bracket to the app.json web configuration example within the "Getting Started" > "Manual Installation" guide.