[func.search] Add missing period

Author: tkoeppe

source/utilities.tex

@@ -14701,7 +14701,7 @@
 \pnum
 The Boyer-Moore searcher implements the Boyer-Moore search algorithm.
 The Boyer-Moore-Horspool searcher implements the Boyer-Moore-Horspool search algorithm.
-In general, the Boyer-Moore searcher will use more memory and give better runtime performance than Boyer-Moore-Horspool
+In general, the Boyer-Moore searcher will use more memory and give better runtime performance than Boyer-Moore-Horspool.
 
 \rSec3[func.search.default]{Class template \tcode{default_searcher}}