DOC-4904 Added resolved issues to RS 7.8.6 release notes draft

Author: rrelledge

content/operate/rs/release-notes/rs-7-8-releases/rs-7-8-6-tba.md

@@ -94,7 +94,7 @@ The following table shows which Redis modules are compatible with each Redis dat
 
 ### Resolved issues
 
-- TBA?
+- RS147991: Fixed an issue where the creation of too many Replica Of workers could cause the DMC proxy to restart repeatedly.
 
 ## Version changes