Merge pull request #1431 from edu-diaz/fix-documentation

Fixed documentation Go example

content/spin/v3/key-value-store-tutorial.md

@@ -316,6 +316,7 @@ class IncomingHandler(http.IncomingHandler):
                     return Response(404, {"content-type": "text/plain"})
                 case default:
                     return Response(405, {"content-type": "text/plain"})
+```
 
 {{ blockEnd }}