Update preview-docs.yml

Author: dsinghvi

.github/workflows/preview-docs.yml

@@ -18,7 +18,7 @@ jobs:
         env:
           FERN_TOKEN: ${{ secrets.FERN_TOKEN }}
         run: |
-          OUTPUT=$(fern generate --docs --preview 2>&1) || true
+          OUTPUT=$(fern generate --docs --preview --instance fern-api.docs.buildwithfern.com/learn 2>&1) || true
           echo "$OUTPUT"
           URL=$(echo "$OUTPUT" | grep -oP 'Published docs to \K.*(?= \()')
           echo "Preview URL: $URL"