D8Core-7339: added help text to social links in footer.

config/sync/field.field.config_pages.stanford_local_footer.su_local_foot_social.yml

@@ -16,7 +16,7 @@ field_name: su_local_foot_social
 entity_type: config_pages
 bundle: stanford_local_footer
 label: 'Social Links'
-description: ''
+description: 'Links added in this section will automatically create icons that will appear in your footer. Supported social links include: Facebook, Instagram, X, YouTube, LinkedIn, Google Scholar, Mastodon.social, Threads, Bluesky, Github, and Flickr.'
 required: false
 translatable: false
 default_value: {  }