fix(docs): Terms of Service links to Privacy Policy over HTTP

**Path:** `docs/terms-of-service.mdx`

## Description

Line 114 of the Terms of Service page links to the Privacy Policy using `http://` instead of `https://`:

> For more information regarding our collection, use, and disclosure of personal data [...] please see our [Privacy Policy](http://docs.base.org/privacy-policy).

`docs.base.org` serves over HTTPS everywhere else on the site.

## Suggested fix

Update the link to `https://docs.base.org/privacy-policy`.