Typos (#1239)

* typo Update privacy-policy.md

The spelling error in the text.

* typo Update terms-of-service.md

There is one orthographic mistake.

* Typo Update README.md

Typographical issue:

- In the line:
  **"You authorize and license to Coinbase"**
  It should be:
  **"You authorize and license Coinbase"**
  The preposition "to" is unnecessary here.

Fixed.