Update multiple-assignments.md

Author: kyouko-taiga

content/multiple-assignments.md

@@ -2,7 +2,7 @@
 layout: sip
 permalink: /sips/:title.html
 stage: implementation
-status: waiting-for-implementation
+status: under-review
 presip-thread: https://contributors.scala-lang.org/t/pre-sip-multiple-assignments/6425
 title: SIP-59 - Multiple Assignments
 ---