Fix some javadoc.

Change-Id: I032d0438d70d5f519c7a1c0e9ec8282b67f72d38
Reviewed-on: http://gerrit.dmdirc.com/3739
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Chris Smith <chris@dmdirc.com>
Update submodules: plugins (new commits)

plugins:
    f0dee4b Greg Holmes <greg@dmdirc.com>
            Fix some javadoc.

            Gerrit: http://gerrit.dmdirc.com/3740

Change-Id: I65f07e0ea03795d43ffab0255e67b8b9ebc3a5a0