document support for WebLogic in 4.0.2

Pages to update for the 4.0.2 launch:

(1) http://confluence.atlassian.com/display/JIRA/JIRA+4.0.2+Release+Notes
(2) http://confluence.atlassian.com/display/JIRA/JIRA+4.0.2+Upgrade+Guide
(3) http://confluence.atlassian.com/display/JIRA/Supported+Platforms
=> for "Oracle WebLogic", add "WebLogic 9.2 with JIRA 4.0.2" (NB. no need to mention the Sun JVM or the patch)
=> for "IBM WebSphere", change "JIRA 4.0.1" to "JIRA 4.0.1 and "JIRA 4.0.2"
(4) http://confluence.atlassian.com/display/JIRA/Installing+JIRA+on+Oracle+WebLogic+9.2
=> change warning at top of page to: "If you are using WebLogic 9.2, it is recommended that you use JIRA 4.0.2."