Issue #28763: Use double hyphens (rendered as en-dashes) in numerical ranges
in the documentation.
diff --git a/Doc/library/cmath.rst b/Doc/library/cmath.rst
index fffdc9f..b80eaba 100644
--- a/Doc/library/cmath.rst
+++ b/Doc/library/cmath.rst
@@ -255,6 +255,6 @@
Kahan, W: Branch cuts for complex elementary functions; or, Much ado about
nothing's sign bit. In Iserles, A., and Powell, M. (eds.), The state of the art
- in numerical analysis. Clarendon Press (1987) pp165-211.
+ in numerical analysis. Clarendon Press (1987) pp165--211.