Align lazy and future operators #26446

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

@@ -0,0 +1,35 @@
+# lazySource
+
+Defers creation and materialization of a `Source` until there is demand.
+
+@ref[Source operators](../index.md#source-operators)
+
+@@@div { .group-scala }
+
+## Signature
+
+@@signature [Source.scala](/akka-stream/src/main/scala/akka/stream/scaladsl/Source.scala) { #lazySource }
+
+@@@
+
+## Description
+
+Defers creation and materialization of a `Source` until there is demand, then emits the elements from the source
+downstream just like if it had been created up front.
+
+See also @ref:[lazyFutureSource](lazyFutureSource.md).
+
+Note that asynchronous boundaries (and other operators) in the stream may do pre-fetching which counter acts
+the laziness and will trigger the factory immediately.
+
+
+## Reactive Streams semantics
+
+@@@div { .callout }
+
+**emits** depends on the wrapped `Source`
+
+**completes** depends on the wrapped `Source`
+
+@@@
+