Change occurrances of 'stop watch' to 'stopwatch' (#1260)

docs/SUMMARY.md

@@ -39,7 +39,7 @@
     * [Telegraph](/projects/telegraph)
     * [Railway Crossing](/projects/railway-crossing)
     * [Karel](/projects/karel)
-    * [Stop Watch](/projects/stopwatch)
+    * [Stopwatch](/projects/stopwatch)
     * [Name Tag](/projects/name-tag)
     * [Step counter](/projects/step-counter)
     * [Servo calibrator](/projects/servo-calibrator)

docs/projects/fashion.md

@@ -14,7 +14,7 @@
   "description": "Keep up with the times using your fancy micro:bit watch",
   "imageUrl":"/static/mb/projects/a10-watch.png"
 }, {
-  "name": "Stop Watch",
+  "name": "Stopwatch",
   "description": "How time passes, keep track of how much",
   "url": "/projects/stopwatch",
   "imageUrl":"/static/mb/projects/stopwatch.png",