Resolve ""About this feature" link should open in new window"

app/views/shared/issuable/form/_merge_params.html.haml

@@ -19,4 +19,4 @@
       = check_box_tag 'merge_request[squash]', '1', issuable.squash, class: 'form-check-input'
       = label_tag 'merge_request[squash]', class: 'form-check-label' do
         Squash commits when merge request is accepted.
-        = link_to 'About this feature', help_page_path('user/project/merge_requests/squash_and_merge')
+        = link_to icon('question-circle'), help_page_path('user/project/merge_requests/squash_and_merge'), target: '_blank'

changelogs/unreleased/55192-about-link-in-new-window.yml

+---
+title: Resolve About this feature link should open in new window
+merge_request: 24149
+author:
+type: fixed