[doc] Link to deprecation policy PEP from the DeprecationWarning documentation (GH...

(cherry picked from commit a7ef15aae8608560bffeeaba412c10e52cab07dd)

Co-authored-by: Łukasz Langa <lukasz@langa.pl>

diff --git a/Doc/library/exceptions.rst b/Doc/library/exceptions.rst
index 85cd193f903b0f7c44cd435d27a7dc1fff0a2fc5..88ce6847bb392c62bd39ca71f5a0a69d5973def9 100644 (file)
--- a/Doc/library/exceptions.rst
+++ b/Doc/library/exceptions.rst
@@ -717,6 +717,8 @@ The following exceptions are used as warning categories; see the
    (:pep:`565`). Enabling the :ref:`Python Development Mode <devmode>` shows
    this warning.
 
+   The deprecation policy is described in :pep:`387`.
+
 
 .. exception:: PendingDeprecationWarning
 
@@ -731,6 +733,8 @@ The following exceptions are used as warning categories; see the
    Ignored by the default warning filters. Enabling the :ref:`Python
    Development Mode <devmode>` shows this warning.
 
+   The deprecation policy is described in :pep:`387`.
+
 
 .. exception:: SyntaxWarning