Clarify the code editor intro

Describe the Issue

The following text in client/i18n/locales/english/intro.json needs correction.

1. lecture-working-with-code-editors-and-ides in relational-databases-v9:

   You will learn various concepts about the most popular code editor, VS Code such as its installation, how to create a project in it, keyboard shortcuts, and extensions.

   The appositive VS Code lacks a closing comma, and the list mixes a noun, a how-to clause, and feature names.

Affected Pages

https://github.com/freeCodeCamp/freeCodeCamp/blob/dbe809859e2a1c4a045c48e67e348b80c194334b/client/i18n/locales/english/intro.json

Expected behavior

1. The second sentence should read You will learn how to install VS Code, create a project, use keyboard shortcuts, and work with extensions.