[3.12] gh-128017: Make a note that sys variables are read-only (GH-128887) (#128909)

gh-128017: Make a note that sys variables are read-only (GH-128887)
(cherry picked from commit 313b96eb8b8d0ad3bac58d633822a0a3705ce60b)

Co-authored-by: Srinivas Reddy Thatiparthy (తాటిపర్తి శ్రీనివాస్  రెడ్డి) <thatiparthysreenivas@gmail.com>

diff --git a/Doc/library/sys.rst b/Doc/library/sys.rst
index 90c794e3f3c58d68e4c47073f075401e76d1a220..70844d4d26b1cb327dfeece525b6aeb0edca52c0 100644 (file)
--- a/Doc/library/sys.rst
+++ b/Doc/library/sys.rst
@@ -8,7 +8,7 @@
 
 This module provides access to some variables used or maintained by the
 interpreter and to functions that interact strongly with the interpreter. It is
-always available.
+always available. Unless explicitly noted otherwise, all variables are read-only.
 
 
 .. data:: abiflags