Start on the 'brick' api topics (#280)

* Start on the 'brick' api topics

* Add the delay to clear screen example

* Better output for clearsceen example

libs/mood/_locales/mood-jsdoc-strings.json

@@ -1,7 +1,7 @@
 {
   "brick.Mood": "A mood",
   "brick.Mood.show": "Shows the mood on the EV3",
-  "brick.showMood": "Shows a mood",
+  "brick.showMood": "Show a mood on the brick's screen",
   "moods.angry": "An angry mood",
   "moods.awake": "A awake mood",
   "moods.dizzy": "A dizzy mood",

libs/mood/mood.ts

@@ -1,9 +1,10 @@
 namespace brick {
     /**
-     * Shows a mood
+     * Show a mood on the brick's screen
      */
     //% weight=90
     //% blockId=moodShow block="show mood %mood=mood_image_picker"
+    //% help=brick/show-mood
     //% weight=101 group="Screen" blockGap=8
     export function showMood(mood: Mood) {
         if(mood)