[simd.bit] Add period to end of sentence (#7887)

Author: Andreas-Krug

source/numerics.tex

@@ -18963,7 +18963,7 @@
 \begin{itemdescr}
 \pnum
 \constraints
-The type \tcode{V::value_type} is an unsigned integer type\iref{basic.fundamental}
+The type \tcode{V::value_type} is an unsigned integer type\iref{basic.fundamental}.
 
 \pnum
 \returns
@@ -18991,7 +18991,7 @@
 \begin{itemdescr}
 \pnum
 \constraints
-The type \tcode{V::value_type} is an unsigned integer type\iref{basic.fundamental}
+The type \tcode{V::value_type} is an unsigned integer type\iref{basic.fundamental}.
 
 \pnum
 \returns