[PR] Fix `[silence]` -> `[declarations]` in changelog
[PR] Fix `[silence]` -> `[declarations]` in changelog

Summary:
This was renamed when it finally landed. Fixes https://github.com/facebook/flow/issues/6572, though there was a concern brought up there about the naming.
Pull Request resolved: https://github.com/facebook/flow/pull/6582

Differential Revision: D8804456

Pulled By: gabelevi

fbshipit-source-id: a173b164a919d186fc6385966dfaeeaed3e503a8

mroch/flow,popham/flow,jamesgpearce/flow,AgentME/flow,gabelevi/flow,jamesgpearce/flow,samwgoldman/flow,claudiopro/flow,mroch/flow,jamesgpearce/flow,nmote/flow,facebook/flow,facebook/flow,claudiopro/flow,AgentME/flow,JonathanUsername/flow,JonathanUsername/flow,samwgoldman/flow,AgentME/flow,JonathanUsername/flow,nmote/flow,samwgoldman/flow,facebook/flow,facebook/flow,AgentME/flow,mroch/flow,gabelevi/flow,facebook/flow,popham/flow,nmote/flow,gabelevi/flow,popham/flow,samwgoldman/flow,popham/flow,jamesgpearce/flow,nmote/flow,mroch/flow,jamesgpearce/flow,JonathanUsername/flow,popham/flow,claudiopro/flow,JonathanUsername/flow,popham/flow,samwgoldman/flow,facebook/flow,nmote/flow,jamesgpearce/flow,gabelevi/flow,claudiopro/flow,JonathanUsername/flow,JonathanUsername/flow,jamesgpearce/flow,samwgoldman/flow,popham/flow,facebook/flow,AgentME/flow,mroch/flow,mroch/flow,gabelevi/flow,gabelevi/flow,mroch/flow,claudiopro/flow,gabelevi/flow,nmote/flow,nmote/flow,samwgoldman/flow