[simd.bit] Use libconcept for integral

Author: hewillk

source/numerics.tex

@@ -19781,7 +19781,7 @@
 \begin{itemdescr}
 \pnum
 \constraints
-The type \tcode{V::value_type} models \tcode{integral}.
+The type \tcode{V::value_type} models \libconcept{integral}.
 
 \pnum
 \returns
@@ -19869,7 +19869,7 @@
  \item
    The type \tcode{V0::value_type} is an unsigned integer type\iref{basic.fundamental},
  \item
-   the type \tcode{V1::value_type} models \tcode{integral},
+   the type \tcode{V1::value_type} models \libconcept{integral},
  \item
    \tcode{V0::size() == V1::size()} is \tcode{true}, and
  \item