[docs] explicit inexact object type docs
[docs] explicit inexact object type docs

Summary: Pretty surprised this was only documented in the options and lints section. Adding this to the object type docs

Reviewed By: dsainati1

Differential Revision: D19906841

fbshipit-source-id: 122adf19cab84aa3fd5305e42bd2a361ef84b99c

nmote/flow,nmote/flow,nmote/flow,nmote/flow,nmote/flow,nmote/flow,nmote/flow