Heroku: Heroku reworded the Key-Value Store Premium 9 feature 'High availability' to 'High availability with low-latency failov…

["Single tenant (dedicated server)","High availability"] → ["Single tenant (dedicated server)","High availability with low-latency failover"]

Heroku reworded the Key-Value Store Premium 9 feature 'High availability' to 'High availability with low-latency failover'. 'Single tenant (dedicated server)' was unchanged.