message: baseof template: Fix typo in Twitter card featured image implementation
diff: {{ end }}
  <!-- Twitter cards -->
  -{{- with .Params.featuredImage }}
  +{{- with .Params.featured_image }}
  <meta name="twitter:card" content="summary_large_image">
  <meta name="twitter:image" content="{{ . | absURL }}">
  {{- else }}
  