Apply suggestions from code review

Co-authored-by: Bénédikt Tran <[email protected]>

Author: skirpichev

Doc/library/math.rst

@@ -379,7 +379,8 @@ Floating point manipulation functions
 .. function:: isnormal(x)
 
    Return ``True`` if *x* is a normal floating-point number, that is a finite
-   nonzero number, that is not a subnormal.  Return ``False`` otherwise.
+   nonzero number that is not a subnormal (see :func:`issubnormal`).
+   Return ``False`` otherwise.
 
    .. versionadded:: next
 

Modules/mathmodule.c

@@ -3127,7 +3127,7 @@ static PyObject *
 math_issubnormal_impl(PyObject *module, double x)
 /*[clinic end generated code: output=4e76ac98ddcae761 input=9a20aba7107d0d95]*/
 {
-#if defined (__STDC_VERSION__) && __STDC_VERSION__ >= 202311L
+#if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 202311L
     return PyBool_FromLong((long)issubnormal(x));
 #else
     return PyBool_FromLong((long)(isfinite(x) && x && !isnormal(x)));