Minor corrections to README.md
Minor corrections to README.md

Change-Id: I0b635789fa68815f0b84377ccd21a97bec038fca
ORIGINAL_AUTHOR=Bartosz Przydatek <przydatek@google.com>
GitOrigin-RevId: c2450855999f4a068cbba21050c4552f31a94a66

google/tink,google/tink,google/tink,google/tink,google/tink,google/tink,google/tink,google/tink