Doc: fix link redirect (GH-96606)

"Hyperbolic_function" -> "Hyperbolic_functions"

Author: partev

Doc/library/math.rst

@@ -534,7 +534,7 @@ Angular conversion
 Hyperbolic functions
 --------------------
 
-`Hyperbolic functions <https://en.wikipedia.org/wiki/Hyperbolic_function>`_
+`Hyperbolic functions <https://en.wikipedia.org/wiki/Hyperbolic_functions>`_
 are analogs of trigonometric functions that are based on hyperbolas
 instead of circles.