doc/releases: correct v18.2.8 release date
Fixes: 30a38149e6bd90192330e61fe3b4a29ce0823ad2 Signed-off-by: Patrick Donnelly <pdonnell@ibm.com>
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Patrick Donnelly committed
6452077ed9ac6b690a9721e9b98c1a3a3871e4ef
Parent: 88819d7