Update rfc-feature.md

Signed-off-by: amzn-yuyi <[email protected]>

.github/ISSUE_TEMPLATE/rfc-feature.md

@@ -2,7 +2,7 @@
 name: RFC Feature request
 about: Create Feature RFC for this project
 title: Proposed RFC Feature =description=
-labels: 'rfc-feature'
+labels: 'rfc-feature','sig/ui-ux
 assignees: ''
 
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