I created an account on cwiki.apache.org, but I don't seem to have editing privileges to the Struts 2 WW space.

The WW space is bundled with the Struts distribution, and, eventually, the content may be checked into an ASF repository. Accordingly, all volunteers working on the space must have a Contributor's License Agreement on file.

Once a CLA is submitted, you can request a karma upgrade on the dev list. After the CLA is submitted, it make take several days for it to be processed by the ASF Secretary (who is a part time volunteer, like everyone else around here). The roster of CLAs is available to ASF members, so we will know when it is processed.