fixup: minor transcription mistakes

Author: jensmaurer

source/lib-intro.tex

@@ -157,7 +157,7 @@
 Equivalently, a call to a C standard library function is
 a non-constant library call
 if \tcode{errno} is set
-when math \tcode{errhandling \& MATH ERRNO} is \tcode{true}.
+when \tcode{math_errhandling \& MATH_ERRNO} is \tcode{true}.
 \end{note}
 
 \rSec1[description]{Method of description}

source/numerics.tex

@@ -9677,11 +9677,11 @@
   constexpr float ceilf(float x);
   constexpr long double ceill(long double x);
 
-  float floor(float x);                 // see \ref{library.c}
-  double floor(double x);
-  long double floor(long double x);     // see \ref{library.c}
-  float floorf(float x);
-  long double floorl(long double x);
+  constexpr float floor(float x);               // see \ref{library.c}
+  constexpr double floor(double x);
+  constexpr long double floor(long double x);   // see \ref{library.c}
+  constexpr float floorf(float x);
+  constexpr long double floorl(long double x);
 
   float nearbyint(float x);             // see \ref{library.c}
   double nearbyint(double x);