Update release cadence

_config.yml

@@ -1,5 +1,5 @@
 title: Release Management Blog
-description: Thoughts and facts on shipping quality software <br> by the team that ships Firefox every 6 to 8 weeks
+description: Thoughts and facts on shipping quality software <br> by the team that ships Firefox every 4 weeks
 extradescription: We talk here about release management at Mozilla, tooling helping decision-making, static analysis and community building around our pre-release channels.
 email: release-mgmt@mozilla.com
 url: "https://release.mozilla.org"