Clarify NNAPI documentation for RESHAPE

Bug: 117176461
Test: mma
Change-Id: I620873536ed99ac79b7eced286a8f2621524290b
Merged-In: I620873536ed99ac79b7eced286a8f2621524290b
(cherry picked from commit 5f5d5f9a54d4c3f17731acdb4ae02252e9497df0)
3 files changed