docs: fix remaining language errors

nbs/docs/experiments/ETS_ray_m5.ipynb

@@ -177,7 +177,7 @@
    "id": "9a3065dc-a8f5-4ad0-be2a-39d5330d4369",
    "metadata": {},
    "source": [
-    "Since the M5 dataset contains intermittent time series, we add a constant to avoid problems during the training phase. Later, we will substract the constant from the forecasts."
+    "Since the M5 dataset contains intermittent time series, we add a constant to avoid problems during the training phase. Later, we will subtract the constant from the forecasts."
    ]
   },
   {

nbs/docs/tutorials/ElectricityPeakForecasting.ipynb

@@ -478,7 +478,7 @@
    "metadata": {},
    "source": [
     ":::{.callout-important}\n",
-    "When using `cross_validation` make sure the forecasts are produced at the desired timestamps. Check the `cutoff` column which specifices the last timestamp before the forecasting window.\n",
+    "When using `cross_validation` make sure the forecasts are produced at the desired timestamps. Check the `cutoff` column which specifies the last timestamp before the forecasting window.\n",
     ":::"
    ]
   },