[13] RFR JDK-8220258 "fix headings in java.smartcardio"

[Valerie Peng]

Can someone help reviewing this? Just a javadoc one-line fix.

Bug: https://bugs.openjdk.java.net/browse/JDK-8220258

Webrev: http://cr.openjdk.java.net/~valeriep/8220258/webrev.00/

Thanks,

Valerie