Reduce heading font size in validate CI lint page

app/views/projects/ci/lints/show.html.haml

 - page_title _("CI Lint")
 - page_description _("Validate your GitLab CI configuration file")
 
-%h2.pt-3.pb-3= _("Validate your GitLab CI configuration")
+%h4.pt-3.pb-3= _("Validate your GitLab CI configuration")
 
 #js-ci-lint{ data: { endpoint: project_ci_lint_path(@project), pipeline_simulation_help_page_path: help_page_path('ci/lint', anchor: 'pipeline-simulation') , lint_help_page_path: help_page_path('ci/lint', anchor: 'validate-basic-logic-and-syntax') } }

changelogs/unreleased/yo-master-patch-80251.yml

+---
+title: Reduce heading font size in validate CI lint page
+merge_request: 51042
+author: Yogi (@yo)
+type: other