Update API Parameter documentation for Equip call

the function that is called actually expects different values than specified in the documentation.

This is related to #3525.
The API itself works, it just does no validation of the input and the documentation is wrong, which is why I used it wrong.

Having some kind of validation would probably still a good idea.
Merge pull request #3540 from vIiRuS/patch-1

Update API Parameter documentation for Equip call