[cmath.syn] Align function parameters of ellint_3 (cplusplus#8581)

Author: eisenwave

source/numerics.tex

@@ -9761,7 +9761,7 @@
 
   // \ref{sf.cmath.ellint.3}, incomplete elliptic integral of the third kind
   @\placeholdernc{floating-point-type}@ ellint_3(@\placeholdernc{floating-point-type}@ k, @\placeholdernc{floating-point-type}@ nu,
-                                 @\placeholdernc{floating-point-type}@ phi);
+                               @\placeholdernc{floating-point-type}@ phi);
   float               ellint_3f(float k, float nu, float phi);
   long double         ellint_3l(long double k, long double nu, long double phi);