Fix type-o in unsupported data type error message (#16537)
Summary:
-In the case where an operator does not support a given data type
an error message is emitted to alert the user, this message is
incorrectly structured. This commit adds to and rearranges the
error message to make it a little clearer.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/16537
Differential Revision: D13958859
Pulled By: zou3519
fbshipit-source-id: 935fc3adcef2f969042b1db902c9ec004488ea9c
