add TODOs to encourage contributing operator examples (#25478)

akka-docs/src/main/paradox/stream/operators/FileIO/toPath.md

@@ -12,3 +12,6 @@ Create a sink which will write incoming `ByteString` s to a given file path.
 
 @@@
 
+## Description
+
+TODO: We would welcome help on contributing descriptions and examples, see: https://github.com/akka/akka/issues/25646

akka-docs/src/main/paradox/stream/operators/Sink/asPublisher.md

@@ -5,6 +5,7 @@ Integration with Reactive Streams, materializes into a `org.reactivestreams.Publ
 @ref[Sink operators](../index.md#sink-operators)
 
 @@@ div { .group-scala }
+
 ## Signature
 
 @@signature [Sink.scala](/akka-stream/src/main/scala/akka/stream/scaladsl/Sink.scala) { #asPublisher }
@@ -12,3 +13,6 @@ Integration with Reactive Streams, materializes into a `org.reactivestreams.Publ
 @@@
 
 
+## Description
+
+TODO: We would welcome help on contributing descriptions and examples, see: https://github.com/akka/akka/issues/25646

akka-docs/src/main/paradox/stream/operators/Sink/fromSubscriber.md

@@ -12,3 +12,6 @@ Integration with Reactive Streams, wraps a `org.reactivestreams.Subscriber` as a
 
 @@@
 
+## Description
+
+TODO: We would welcome help on contributing descriptions and examples, see: https://github.com/akka/akka/issues/25646

akka-docs/src/main/paradox/stream/operators/Source-or-Flow/collectType.md

@@ -14,3 +14,6 @@ Transform this stream by testing the type of each of the elements on which the e
 
 
 
+## Description
+
+TODO: We would welcome help on contributing descriptions and examples, see: https://github.com/akka/akka/issues/25646

akka-docs/src/main/paradox/stream/operators/Source/asSubscriber.md

@@ -12,9 +12,4 @@ Integration with Reactive Streams, materializes into a `org.reactivestreams.Subs
 
 ## Description
 
-
-
-@@@div { .callout }
-
-@@@
-
+TODO: We would welcome help on contributing descriptions and examples, see: https://github.com/akka/akka/issues/25646

akka-docs/src/main/paradox/stream/operators/Source/fromPublisher.md

@@ -12,3 +12,6 @@ Integration with Reactive Streams, subscribes to a `org.reactivestreams.Publishe
 
 @@@
 
+## Description
+
+TODO: We would welcome help on contributing descriptions and examples, see: https://github.com/akka/akka/issues/25646

akka-docs/src/main/paradox/stream/operators/StreamConverters/fromInputStream.md

@@ -14,9 +14,4 @@ Create a source that wraps an `InputStream`.
 
 ## Description
 
-
-
-@@@div { .callout }
-
-@@@
-
+TODO: We would welcome help on contributing descriptions and examples, see: https://github.com/akka/akka/issues/25646

akka-docs/src/main/paradox/stream/operators/StreamConverters/fromJavaStream.md

@@ -12,3 +12,6 @@ Create a source that wraps a Java 8 `Stream`.
 
 @@@
 
+## Description
+
+TODO: We would welcome help on contributing descriptions and examples, see: https://github.com/akka/akka/issues/25646

akka-docs/src/main/paradox/stream/operators/StreamConverters/fromOutputStream.md

@@ -12,3 +12,6 @@ Create a sink that wraps an `OutputStream`.
 
 @@@
 
+## Description
+
+TODO: We would welcome help on contributing descriptions and examples, see: https://github.com/akka/akka/issues/25646

akka-docs/src/main/paradox/stream/operators/StreamConverters/javaCollector.md

@@ -14,9 +14,4 @@ Create a sink which materializes into a @scala[`Future`] @java[`CompletionStage`
 
 ## Description
 
-
-
-@@@div { .callout }
-
-@@@
-
+TODO: We would welcome help on contributing descriptions and examples, see: https://github.com/akka/akka/issues/25646

akka-docs/src/main/paradox/stream/operators/StreamConverters/javaCollectorParallelUnordered.md

@@ -14,9 +14,4 @@ Create a sink which materializes into a @scala[`Future`] @java[`CompletionStage`
 
 ## Description
 
-
-
-@@@div { .callout }
-
-@@@
-
+TODO: We would welcome help on contributing descriptions and examples, see: https://github.com/akka/akka/issues/25646