fix reference to the documentation after moving around fusiondirectory documentationin UPGRADE.md and README.md

Hello,

we need to fix the documentation since i was moved to only have one documentation for fusiondirectory, argonaut,schema2ldif

Cheers

changed milestone to %FusionDirectory 1.4

added PJ1802-0188 label

cloned from fd#6157 (closed)

mentioned in commit 4eecfc49

mentioned in commit c3bc5995

added Fixed label