Improve docs

include/fmt/core.h

@@ -2972,7 +2972,7 @@ FMT_API auto vformat(string_view fmt, format_args args) -> std::string;
   **Example**::
 
     #include <fmt/core.h>
-    std::string message = fmt::format("The answer is {}", 42);
+    std::string message = fmt::format("The answer is {}.", 42);
   \endrst
 */
 template <typename... T>