<Swing Dev> Review Request for 8044394: fix some typos in javadoc for BasicOptionPaneUI.java

[Steve Sides]

Hello,

Could you please review the fix for the following bug:
    https://bugs.openjdk.java.net/browse/jdk-8044394

Webrev corresponding:
http://cr.openjdk.java.net/~ssides/8044394/8044394.0/  <http://cr.openjdk.java.net/%7Essides/8044394/8044394.0/>

This simply addresses some typos and grammar in the javadoc for
addMessageComponents() in swing/plaf/basic/BasicOptionPaneUI.java.

thanks,
-steve