mark docs tutorial/message_queues are low-level and outdated

docs/src/tutorial/message_queues.md

@@ -7,6 +7,14 @@ DocTestSetup = quote
 end
 ```
 
+!!! warning
+
+    This section is rather low-level, created before a lot of user-friendly tools were added.
+    The approach described here still functions well, however we now provide a more convenient interface and pre-build message passing channels.
+    In particular, the tagging & querying system (based arround `tag!` and `query`), the [`messagebuffer`](@ref), and the available [`channel`](@ref), [`qchannel`](@ref) and [`QuantumChannel`](@ref)
+    probably cover all your needs.
+    You might still be interested in reading this section in order to learn some of the low-level tooling on which the more recent developments were built.
+
 In network simulations, a convenient synchronization primitive is the passing of messages between nodes.
 The `ResumableFunctions` and `ConcurrentSim` libraries provide such primitives, convenient to use with `QuatumSavory`.