asyncio doc: add "asyncio-" prefix to references
diff --git a/Doc/library/asyncio-stream.rst b/Doc/library/asyncio-stream.rst
index b5ffdba..52da4e0 100644
--- a/Doc/library/asyncio-stream.rst
+++ b/Doc/library/asyncio-stream.rst
@@ -1,6 +1,6 @@
 .. currentmodule:: asyncio
 
-.. _streams:
+.. _asyncio-streams:
 
 ++++++++++++++++++++++++
 Streams (high-level API)