minor text edits

tutorials/UNet_SPIDER.ipynb

@@ -1170,7 +1170,7 @@
     {
       "cell_type": "markdown",
       "source": [
-        "Obviously these examples are somewhat cherry-picked; i.e.,  I chose the test image indices 15-20 because these images are relatively clear. Let's look at an example where the image is not as clear and therefore the model does not perform as well:"
+        "Let's look at an example where the model does not perform as well:"
       ],
       "metadata": {
         "id": "LgzkWWjWzusQ"
@@ -1256,7 +1256,7 @@
     {
       "cell_type": "markdown",
       "source": [
-        "What's going on here? Why is the actual segmentation mask so detailed considering how difficult it is to see the vertebrae in the original image? Let's check the original `.mha` file (see the [load_data](https://huggingface.co/datasets/cdoswald/SPIDER/blob/main/tutorials/load_data.ipynb) tutorial):"
+        "What's going on here? The true segmentation mask is very detailed considering how difficult it is to see the vertebrae in the original image. Let's check the original `.mha` file (see the [load_data](https://huggingface.co/datasets/cdoswald/SPIDER/blob/main/tutorials/load_data.ipynb) tutorial):"
       ],
       "metadata": {
         "id": "CwV-w3lf0JVv"