fix typos in GitHub Issue Template

.github/ISSUE_TEMPLATE.md

@@ -9,9 +9,9 @@ Please include this information:
 - What OS are you running grafana on?
 - What did you do?
 - What was the expected result?
-- What happenend instead?
+- What happened instead?
 
-**IMPORTANT** If it realates to metric data viz:
+**IMPORTANT** If it relates to metric data viz:
 - An image or text representation of your metric query
 - The raw query and response for the network request (check this in chrome dev tools network tab, here you can see metric requests and other request, please include the request body and request response)