Clarify instructions

Author: ErikSchierboom

exercises/split-second-stopwatch/instructions.md

@@ -4,7 +4,7 @@ Your task is to build a stopwatch that can be used to keep track of lap times.
 The stopwatch has the following functionality:
 
 - Start: start/resume time tracking
-- Stop: stop (pause) time tracking
+- Stop: stop/pause time tracking
 - Current lap: retrieve the time tracked for the current lap
 - Previous laps: retrieve the previously recorded lap times
 - Reset: stop time tracking, reset the current lap, and clear all previously recorded laps