Correct and update README binding documentation

[VodBox]

Description

Corrects JSDoc comments so that they accurately reflect the actual bindings and how they're used. Additionally, adds section on where to get TypeScript type definitions for the bindings.

Motivation and Context

Having correct documentation of the functions, and making it easier to find the TypeScript definitions.

How Has This Been Tested?

N/a.

Types of changes

• Documentation (a change to documentation pages)

Checklist:

• [x] My code has been run through clang-format.
• [x] I have read the contributing document.
• [x] My code is not on the master branch.
• [x] The code has been tested.
• [x] All commit messages are properly formatted and commits squashed where appropriate.
• [x] I have included updates to all appropriate documentation.