docs: fix dbapi examples notebook (#134)

* fix dbapi examples notebook

* fix typo

Author: stepansergeevitch

examples/dbapi.ipynb

@@ -187,13 +187,9 @@
     "    select * from test_table where id > 2;\n",
     "\"\"\"\n",
     ")\n",
-    "print(cursor._row_sets[0][2])\n",
-    "print(cursor._row_sets[1][2])\n",
-    "print(cursor._rows)\n",
-    "# print(\"First query: \", cursor.fetchall())\n",
+    "print(\"First query: \", cursor.fetchall())\n",
     "assert cursor.nextset()\n",
-    "print(cursor._rows)\n",
-    "# print(\"Secont query: \", cursor.fetchall())\n",
+    "print(\"Second query: \", cursor.fetchall())\n",
     "assert cursor.nextset() is None"
    ]
   },