1439 Fix missing file in MICCAI tutorial (Project-MONAI#1441)

Fixes Project-MONAI#1439 .

### Description
This PR is used to add the missing csv file producting in MICCAI
tutorial.
### Checks
<!--- Put an `x` in all the boxes that apply, and remove the not
applicable items -->
- [ ] Avoid including large-size files in the PR.
- [ ] Clean up long text outputs from code cells in the notebook.
- [ ] For security purposes, please check the contents and remove any
sensitive info such as user names and private key.
- [ ] Ensure (1) hyperlinks and markdown anchors are working (2) use
relative paths for tutorial repo files (3) put figure and graphs in the
`./figure` folder
- [ ] Notebook runs automatically `./runner.sh -t <path to .ipynb file>`

---------

Signed-off-by: Yiheng Wang <[email protected]>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

competitions/MICCAI/surgtoolloc/preprocess_detect_scene_and_split_fold.ipynb

@@ -125,6 +125,8 @@
     "    df[lb] = df.tools_present.str.count(lb)\n",
     "\n",
     "labels = df.columns.values[2:]\n",
+    "# uncomment the following line to produce the train.csv file\n",
+    "# df.to_csv('../train.csv', index=False)\n",
     "df.shape"
    ]
   },