Fix typo (#6574)

docs/skillmap/mole/mole1.md

@@ -198,7 +198,7 @@ game.onUpdateInterval(1000, function () {
 <br/>and drop it onto **an empty area** of the workspace.
 
 
-The is an **EVENT** block and it will cause the **ACTION** inside to happen each time a second passes.
+This is an **EVENT** block and it will cause the **ACTION** inside to happen each time a second passes.
 
 ~hint Tell me about events! 💡
 
@@ -298,4 +298,4 @@ mole-images=github:microsoft/arcade-tutorial-extensions/mole-images#v0.0.11
   "main.ts": "",
   "pxt.json": "{\n    \"name\": \"Whackem2 - Assets Only\",\n    \"description\": \"\",\n    \"dependencies\": {\n        \"device\": \"*\"\n    },\n    \"files\": [\n        \"main.blocks\",\n        \"main.ts\",\n        \"README.md\",\n        \"assets.json\",\n        \"images.g.jres\",\n        \"images.g.ts\",\n        \"custom.ts\"\n    ],\n    \"targetVersions\": {\n        \"branch\": \"v1.8.26\",\n        \"tag\": \"v1.8.26\",\n        \"commits\": \"https://github.com/microsoft/pxt-arcade/commits/6434cb63948fe7c1d1a7498115a4bc495495512c\",\n        \"target\": \"1.8.26\",\n        \"pxt\": \"7.4.27\"\n    },\n    \"preferredEditor\": \"tsprj\"\n}\n"
 }
-```
+```