Fix minor typos, add text for other APIs.

Created by: borisbaldassari

Hi,

As discussed these are my few minor typos fixes. One noticeable change is about the list of other APIs. At first the wording sounded like they're related (others and api.e.o) and e.g. the rate limit discussed just below seemed to apply to the other APIs too. Which is obviously not the case, so I propose a different wording. Up to you of course.

Cheers,