8148820: Missing @since Javadoc tag in Logger.log(Level, Supplier)

Summary: Added @since 1.8
Reviewed-by: lancea, rriggs

src/share/classes/java/util/logging/Logger.java

@@ -800,6 +800,7 @@ public class Logger {
      * @param   level   One of the message level identifiers, e.g., SEVERE
      * @param   msgSupplier   A function, which when called, produces the
      *                        desired log message
+     * @since 1.8
      */
     public void log(Level level, Supplier<String> msgSupplier) {
         if (!isLoggable(level)) {