fixes typo

Signed-off-by: Wenqi Li <[email protected]>

Author: wyli

deep_atlas/deep_atlas_tutorial.ipynb

@@ -70,7 +70,7 @@
     "  If we want a deep neural network to do registration, then we can use the segmentation algorithm in this manner to create an objective to train against. We refer to the resulting loss function as _anatomy loss_.\n",
     "  <br>\n",
     "  \n",
-    "- _Reg helps seg:_ Suppose we have a great registration algorithm that can deform one image to another in an anatomically realistic way. Then given just _one_ manually created segmentation, we have an equally great segmentaion algorithm:\n",
+    "- _Reg helps seg:_ Suppose we have a great registration algorithm that can deform one image to another in an anatomically realistic way. Then given just _one_ manually created segmentation, we have an equally great segmentation algorithm:\n",
     "  1. Register the image you want to segment to your _atlas_, the single image for which you already have a segmentation.\n",
     "  2. Use the deformation from the registration to warp the atlas's segmentation back onto to your image.\n",
     "  \n",