Issue #28763: Use double hyphens (rendered as en-dashes) in numerical ranges
in the documentation.
diff --git a/Doc/library/sys.rst b/Doc/library/sys.rst
index e1900c7..31e644e 100644
--- a/Doc/library/sys.rst
+++ b/Doc/library/sys.rst
@@ -231,7 +231,7 @@
(defaulting to zero), or another type of object. If it is an integer, zero
is considered "successful termination" and any nonzero value is considered
"abnormal termination" by shells and the like. Most systems require it to be
- in the range 0-127, and produce undefined results otherwise. Some systems
+ in the range 0--127, and produce undefined results otherwise. Some systems
have a convention for assigning specific meanings to specific exit codes, but
these are generally underdeveloped; Unix programs generally use 2 for command
line syntax errors and 1 for all other kind of errors. If another type of