[alg.search] Add \tcode for true (#7588)

Author: Andreas-Krug

source/algorithms.tex

@@ -4707,7 +4707,7 @@
 \returns
 The first iterator \tcode{i} in the range \range{first}{last - count}
 such that for every non-negative integer \tcode{n} less than \tcode{count}
-the condition $E$ is true.
+the condition $E$ is \tcode{true}.
 Returns \tcode{last} if no such iterator is found.
 
 \pnum