[8] Review request for JDK-8025117: [cleanup] Eliminate doclint errors in javax/swing/text classes

[Yuri Nesterenko]

Hello,

could please review this javadoc fix?

https://bugs.openjdk.java.net/browse/JDK-8025117

Objective is, as stated, to get rid of javadoc doclint error messages.
No changes in specifications; no visible formatting changes, even.

Webrev: http://cr.openjdk.java.net/~yan/jdk-8025117/

Thanks,
-yan