Move warning to signal module and rephrase

Author: robsdedude

Doc/library/signal.rst

@@ -68,6 +68,13 @@ the synchronization primitives from the :mod:`threading` module instead.
 
 Besides, only the main thread of the main interpreter is allowed to set a new signal handler.
 
+.. warning::
+
+   Synchronization primitives such as :class:`threading.Lock` must not be shared
+   between between signal handlers and other threads.
+   Because blocking synchronization calls can be interrupted by signals,
+   such sharing can lead to surprising dead locks.
+
 
 Module contents
 ---------------

Doc/library/threading.rst

@@ -13,14 +13,6 @@ level :mod:`_thread` module.
 
 .. include:: ../includes/wasm-notavail.rst
 
-.. warning::
-
-   Syncrhonization primitives must not be shared between between :mod:`signal`
-   handlers and the main thread.
-   Because blocking syncrhonizations calls can be interrupted by signals,
-   such sharing can lead to surprising dead locks.
-
-
 Introduction
 ------------