ci: fix docs checker for wiki based docs (#27380) (#27382)

(cherry picked from commit 5596988c94)

Co-authored-by: Ankush Menat <ankush@iwebnotes.com>

.github/helper/documentation.py

@@ -24,6 +24,8 @@ def docs_link_exists(body):
 					parts = parsed_url.path.split('/')
 					if len(parts) == 5 and parts[1] == "frappe" and parts[2] in docs_repos:
 						return True
+				elif parsed_url.netloc == "docs.erpnext.com":
+					return True
 
 
 if __name__ == "__main__":