Javadoc section out of date
The section on javadoc is dated. Openjdk is the default install now, and the wiki references Sun. The default eclipse install points to the Oracle download location for javadoc. Not sure if this works with openjdk yet.
Setting default font size section out of date
Eclipse Marketplace section out of date
These steps were not possible on the eclipse-java package as the options did not exist, I can't say if they do or do not on the other packages.
I found the eclipse marketplace was automatically in the help menu