[cmath.syn] Add fmaximum, fmaximum_num, fminimum, and fminimum_num to index

Author: eisenwave

source/numerics.tex

@@ -9274,9 +9274,13 @@
 \indexlibraryglobal{fmax}%
 \indexlibraryglobal{fmaxf}%
 \indexlibraryglobal{fmaxl}%
+\indexlibraryglobal{fmaximum}%
+\indexlibraryglobal{fmaximum_num}%
 \indexlibraryglobal{fmin}%
 \indexlibraryglobal{fminf}%
 \indexlibraryglobal{fminl}%
+\indexlibraryglobal{fminimum}%
+\indexlibraryglobal{fminimum_num}%
 \indexlibraryglobal{fmod}%
 \indexlibraryglobal{fmodf}%
 \indexlibraryglobal{fmodl}%