Update iinfo description to be consistent with finfo (#439)

Author: kgryte

spec/API_specification/array_api/data_type_functions.py

@@ -91,7 +91,7 @@ def iinfo(type: Union[dtype, array], /) -> iinfo_object:
     Returns
     -------
     out: iinfo object
-        a class with that encapsules the following attributes:
+        an object having the following attributes:
 
         - **bits**: *int*