Fix wrong call to TimeSeries.from_series() (#2719)

Author: authierj

CHANGELOG.md

@@ -20,6 +20,7 @@ but cannot always guarantee backwards compatibility. Changes that may **break co
 **Fixed**
 
 - 🔴 / 🟢 Fixed a bug which raised an error when loading torch models that were saved with Darts versions < 0.33.0. This is a breaking change and models saved with version 0.33.0 will not be loadable anymore. [#2692](https://github.com/unit8co/darts/pull/2692) by [Dennis Bader](https://github.com/dennisbader).
+- Fixed a bug in `13-TFT-examples.ipynb` where two calls to `TimeSeries.from_series()` were not providing `series` but `pd.Index`. The method calls were changed to `TimeSeries.from_values()`. [#2719](https://github.com/unit8co/darts/pull/2719) by [Jules Authier](https://github.com/authierj)
 
 **Dependencies**
 

examples/13-TFT-examples.ipynb

@@ -149,7 +149,7 @@
     "series = AirPassengersDataset().load()\n",
     "\n",
     "# we convert monthly number of passengers to average daily number of passengers per month\n",
-    "series = series / TimeSeries.from_series(series.time_index.days_in_month)\n",
+    "series = series / TimeSeries.from_values(series.time_index.days_in_month)\n",
     "series = series.astype(np.float32)\n",
     "\n",
     "# Create training and validation sets:\n",
@@ -570,7 +570,7 @@
     "for col in [\"ice cream\", \"heater\"]:\n",
     "    converted_series.append(\n",
     "        series_ice_heater[col]\n",
-    "        / TimeSeries.from_series(series_ice_heater.time_index.days_in_month)\n",
+    "        / TimeSeries.from_values(series_ice_heater.time_index.days_in_month)\n",
     "    )\n",
     "converted_series = concatenate(converted_series, axis=1)\n",
     "converted_series = converted_series[pd.Timestamp(\"20100101\") :]\n",