Update overview.md

Bad link to PCA docs --it was pointing to XO API docs. I made a redirection URL to not make this mistake again next time.

apiconcepts/Tridion_Docs_15/overview.md

@@ -44,4 +44,4 @@ Domain (Content Manager) Models are mapped to the Presentation (View) Models usi
 Links to download the API reference documentation for RWS Digital Experience Accelerator.
 - [DXA API for .NET](https://docs.sdl.com/DXA/DotNET/2.2/APIDOC/)
 - [DXA API for Java](https://docs.sdl.com/DXA/Java/2.2/APIDOC/)
-- [Content Delivery's Public Content API](https://docs.rws.com/binary/992527/745661/tridion-docs-15/tridion-sites-content-delivery-restful-api-java-)
+- [Content Delivery's Public Content API](https://docs.rws.com/TridionDocs15/PublicContentAPIReference)