[meta.reflection.queries] Add \tcode for explicit

Author: Andreas-Krug

source/meta.tex

@@ -4173,10 +4173,10 @@
 \begin{itemdescr}
 \pnum
 \returns
-\tcode{true} if \tcode{r} represents a member function that is declared explicit.
+\tcode{true} if \tcode{r} represents a member function that is declared \tcode{explicit}.
 Otherwise, \tcode{false}.
 \begin{note}
-If \tcode{r} represents a member function template that is declared explicit,
+If \tcode{r} represents a member function template that is declared \tcode{explicit},
 \tcode{is_explicit(r)} is still \tcode{false}
 because in general,
 such queries for templates cannot be answered.