enlarge docker memory usage (#501)

### What problem does this PR solve?

### Type of change

- [x] Refactoring

rag/app/book.py

@@ -37,7 +37,7 @@ class Pdf(PdfParser):
         start = timer()
         self._layouts_rec(zoomin)
         callback(0.67, "Layout analysis finished")
-        print("paddle layouts:", timer() - start)
+        print("layouts:", timer() - start)
         self._table_transformer_job(zoomin)
         callback(0.68, "Table analysis finished")
         self._text_merge()