[Reviewed] Add some example links (#770)

* Don't show in changelogs

Author: D8H

extensions/reviewed/AutoTyping.json

@@ -23,7 +23,8 @@
     "- Use a condition to check if the typing finished.",
     "- Use a condition to check if a new text character was added. This is useful to trigger audio effects.",
     "- Use the \"CurrentCharacter\" expression to know when a specific character was displayed.",
-    ""
+    "",
+    "The top-down RPG example uses this extension ([open the project online](https://editor.gdevelop.io/?project=example://top-down-rpg))."
   ],
   "origin": {
     "identifier": "AutoTyping",

extensions/reviewed/Health.json

@@ -45,7 +45,9 @@
     "- Duration of shield (seconds) Use \"0\" to make shield permanent",
     "- Rate of shield regeneration (points per second)",
     "- Delay before shield regeneration starts after being hit (seconds)",
-    "- Block excess damage when shield is broken (yes/no)"
+    "- Block excess damage when shield is broken (yes/no)",
+    "",
+    "The top-down RPG example uses this extension ([open the project online](https://editor.gdevelop.io/?project=example://top-down-rpg))."
   ],
   "origin": {
     "identifier": "Health",

extensions/reviewed/PlatformerCharacterAnimator.json

@@ -9,7 +9,11 @@
   "previewIconUrl": "https://resources.gdevelop-app.com/assets/Icons/Glyphster Pack/Master/SVG/Sports and Fitness/Sports and Fitness_training_running_run.svg",
   "shortDescription": "Change animations and horizontal flipping of a platformer character automatically.",
   "version": "1.0.0",
-  "description": "Automatically change the animations and horizontal flipping of a platformer character based on movement and interaction with platform objects.",
+  "description": [
+    "Automatically change the animations and horizontal flipping of a platformer character based on movement and interaction with platform objects.",
+    "",
+    "The platformer example uses this extension ([open the project online](https://editor.gdevelop.io/?project=example://platformer))."
+  ],
   "tags": [
     "animations",
     "platformer",

extensions/reviewed/ShakeObject.json

@@ -27,7 +27,9 @@
     "- To repeat a single-shake effect in a loop, add a condition \"Object is not shaking\" ",
     "- Use a long \"Time between shakes\" to simulate a slow moving object (like a ship rocking back and forth)",
     "- Make sure to \"Stop shaking\" before starting a new shake if it uses different parameters. ",
-    "- Use \"Shake until stopped\" to simulate engine vibration, earthquake, or pulsing"
+    "- Use \"Shake until stopped\" to simulate engine vibration, earthquake, or pulsing",
+    "",
+    "The top-down RPG example uses this extension for damage animations ([open the project online](https://editor.gdevelop.io/?project=example://top-down-rpg))."
   ],
   "origin": {
     "identifier": "ShakeObject",