Update NOTES.ANDROID

Minor typo fix to `adjustment` in the line:
"In such case you have to pass matching target
 name to Configure and shouldn't use -D__ANDROID_API__=N. PATH adjustment
 becomes simpler, $ANDROID_NDK/bin:$PATH suffices."

Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/8054)