[vector] Correct typos in doc of full service ops

[Paul Sandoz]

Hi,

Please review the following that corrects typos in doc of full service ops:

  http://cr.openjdk.java.net/~psandoz/panama/vector-type-full-service-op-doc/webrev/ <http://cr.openjdk.java.net/~psandoz/panama/vector-type-full-service-op-doc/webrev/>

Thanks,
Paul.