Update frontmatter and intro info for the projects API (#27311)

Co-authored-by: Lucas Costi <lucascosti@users.noreply.github.com>

content/rest/projects/columns.md

@@ -1,6 +1,8 @@
 ---
-title: Columns
-intro: ''
+title: Project board columns
+shortTitle: Columns
+allowTitleToDifferFromFilename: true
+intro: 'The Project board columns API lets you create and manage columns on a project board.'
 versions:
   fpt: '*'
   ghes: '*'
@@ -10,3 +12,5 @@ topics:
   - API
 miniTocMaxHeadingLevel: 3
 ---
+
+{% data reusables.projects.projects-api %}