Update SIPs state

Author: scala-improvement-bot

_sips/sips/better-fors.md

@@ -2,7 +2,7 @@
 layout: sip
 permalink: /sips/:title.html
 stage: implementation
-status: waiting-for-implementation
+status: under-review
 title: SIP-62 - For comprehension improvements
 ---
 

_sips/sips/named-tuples.md

@@ -2,7 +2,7 @@
 layout: sip
 permalink: /sips/named-tuples.html
 stage: implementation
-status: waiting-for-implementation
+status: under-review
 presip-thread: https://contributors.scala-lang.org/t/pre-sip-named-tuples/6403/164
 title: SIP-58 - Named Tuples
 ---
@@ -774,4 +774,4 @@ type Person = (name: String, age: Int, addr: Address)
   def x4: Iterator[City] = run(q4)
   def x5: Iterator[(name: String, num: Int)] = run(q5)
   def x6: Iterator[(name: String, zipCode: Int)] = run(q6)
-```
+```

_sips/sips/replace-nonsensical-unchecked-annotation.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-replace-non-sensical-unchecked-annotations/6342
 title: SIP-57 - Replace non-sensical @unchecked annotations
 ---