Review Request for 8044281: Fix doclint warnings (missing javadoc @param and @return tags) in javax.swing.text - Part 1 of 2

[Rocky Sloan]

Hello,

Could you please review Part 1 of the fix for the following bug:
https://bugs.openjdk.java.net/browse/JDK-8044261
This is part 1 of 2.

Webrev corresponding:
http://cr.openjdk.java.net/~yan/8044261/webrev.01/

Change:
Add missing @return and @param javadoc tags in javax.swing.text classes 
to fix doclint warnings.

Thanks,

- Rocky