update labels tags in templates

Author: quentinhaenn

.github/ISSUE_TEMPLATE/doc_improvement.yml

@@ -1,6 +1,6 @@
 name: Documentation improvement
 description: Create a report to help us improve the documentation. Alternatively you can just open a pull request with the suggested change.
-labels: [Documentation, 'Needs Triage']
+labels: ["documentation", "triage"]
 
 body:
 - type: textarea