Fix typo

run_AIFS_v1.ipynb

@@ -547,7 +547,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "To reduce the memory usage of the model once can set certain environment variables, like the number of chunks of the model's mapper.\n",
+    "To reduce the memory usage of the model certain environment variables can be set, like the number of chunks of the model's mapper.\n",
     "Please refer to:\n",
     "- https://anemoi.readthedocs.io/projects/models/en/latest/modules/layers.html#anemoi-inference-num-chunks\n",
     "- https://pytorch.org/docs/stable/notes/cuda.html#optimizing-memory-usage-with-pytorch-cuda-alloc-conf\n",