Summary:
Minor documentation correction for the native components iOS API section.
Before: "Sometimes your native component will have some special properties that you don't want to them to be part of the API"
After: "Sometimes your native component will have some special properties that you don't want to be part of the API"
Confirm section renders correctly via markdown.
Closes https://github.com/facebook/react-native/pull/15914
Reviewed By: TheSavior
Differential Revision: D5817146
Pulled By: buymeasoda
fbshipit-source-id: 075441cf7f5f23a4ca512bae48ca8fc319762b1e