flake8 updates and hopefully no git mishap

Author: christinawilliams

DP1/100_How_to_Use_RSP_Tools/104_Butler_data_access/104_5_Image_subsets_with_the_butler.ipynb

@@ -298,7 +298,7 @@
    "source": [
     "#### 2.3.1. Use edge corners to define box\n",
     "\n",
-    "Now, define a bounding box for the subset `subset_box` specified above using the `Box2I` function. Use the values returned by these methods to define the subset bounding box in pixel coordinates for a subset with edge size 1000 pixels.\n",
+    "Now, define a bounding box called `subset_box` using the `Box2I` function. First, use the values returned by the methods `beginX`, `beginY`, and `getDimensions` to define the  bounding box in pixel coordinates for an image subset with edge size 1000 pixels, before calling `Box2I` in the second cell.\n",
     "\n",
     "Note that `Box2I` takes as its first input the lower left corner coordinates of the box, not the center coordinates."
    ]