Recategorize the hyperbolic Math functions in the documentation (chap…

…el-lang#24569)

[reviewed by @jabraham17]

This was pointed out by Damian - the hyperbolic Math functions were
listed under the trigonometry section but really should have their own
section

Verified the built docs looked good and that
`test/library/standard/Math/docs/usemath.doc.chpl` still passes

modules/standard/Math.chpl

@@ -80,17 +80,22 @@ Constants
 Trigonometric Functions
 ^^^^^^^^^^^^^^^^^^^^^^^
 :proc:`~Math.acos`
-:proc:`~Math.acosh`
 :proc:`~Math.asin`
-:proc:`~Math.asinh`
 :proc:`~Math.atan`
 :proc:`~Math.atan2`
-:proc:`~Math.atanh`
 :proc:`~Math.cos`
-:proc:`~Math.cosh`
 :proc:`~Math.sin`
-:proc:`~Math.sinh`
 :proc:`~Math.tan`
+
+.. _math-hyperbolic:
+
+Hyperbolic Functions
+^^^^^^^^^^^^^^^^^^^^
+:proc:`~Math.acosh`
+:proc:`~Math.asinh`
+:proc:`~Math.atanh`
+:proc:`~Math.cosh`
+:proc:`~Math.sinh`
 :proc:`~Math.tanh`
 
 .. _math-log: