chore: mention CollectWhile

Author: He-Pin

Diff for: stream/src/main/scala/org/apache/pekko/stream/impl/fusing/CollectFirst.scala

@@ -47,7 +47,7 @@ private[pekko] final class CollectFirst[In, Out](pf: PartialFunction[In, Out]) e
         try {
           // 1. `applyOrElse` is faster than (`pf.isDefinedAt` and then `pf.apply`)
           // 2. using reference comparing here instead of pattern matching can generate less and quicker bytecode,
-          //   eg: just a simple `IF_ACMPNE`, and you can find the same trick in `Collect` operator.
+          //   eg: just a simple `IF_ACMPNE`, and you can find the same trick in `CollectWhile` operator.
           //   If you interest, you can check the associated PR for this change and the
           //   current implementation of `scala.collection.IterableOnceOps.collectFirst`.
           val result = pf.applyOrElse(grab(in), NotApplied)