Update artifact metadata subcategory title format to match other subcategory titles (#58039)

Signed-off-by: Meredith Lancaster <malancas@users.noreply.github.com>
Co-authored-by: Jules <19994093+jules-p@users.noreply.github.com>

Author: malancas

content/rest/orgs/artifact-metadata.md

@@ -1,5 +1,5 @@
 ---
-title: Artifact metadata
+title: REST API endpoints for artifact metadata
 shortTitle: Artifact metadata
 intro: "Use these endpoints to retrieve and manage metadata for artifacts in your organization. Artifact metadata provides information about build artifacts, their provenance, and related details."
 versions: # DO NOT MANUALLY EDIT. CHANGES WILL BE OVERWRITTEN BY A 🤖