replace unicode arrows

* ⇒, →, ←
* because we don't want to show them in documentation snippets and
  then it's complicated to avoid that when snippets are
  located in src/test/scala in individual modules
* dont replace object `→` in FSM.scala and PersistentFSM.scala

akka-distributed-data/src/multi-jvm/scala/akka/cluster/ddata/ReplicatorORSetDeltaSpec.scala

@@ -64,8 +64,8 @@ class ReplicatorORSetDeltaSpec extends MultiNodeSpec(ReplicatorORSetDeltaSpec) w
       awaitAssert {
         replicator ! Get(key, ReadLocal)
         val value = expectMsgPF() {
-          case g @ GetSuccess(`key`, _) ⇒ g.dataValue match {
-            case c: ORSet[_] ⇒ c.elements
+          case g @ GetSuccess(`key`, _) => g.dataValue match {
+            case c: ORSet[_] => c.elements
           }
         }
         value should be(expected)