wiki cleanup: release notes

[Michael Bohlender]

http://community.kde.org/Plasma/Active/ReleaseNotes/2.0

there are no release notes for PA 3

do we want/ need release notes for PA 4 or should just delete the link from
http://community.kde.org/Plasma/Active/<http://community.kde.org/Plasma/Active/ReleaseNotes/2.0>
 ?
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