Correct copy to BytesIO

Co-Authored-By: Jason Grout <[email protected]>

Author: pbugnion

docs/source/examples/Widget List.ipynb

@@ -1054,7 +1054,7 @@
     "#=> ]\n",
     "```\n",
     "\n",
-    "The contents of the file uploaded are in the value of the `content` key. They are a [memory view](https://docs.python.org/3.8/library/stdtypes.html#memory-views):\n",
+    "The contents of the file uploaded are in the value of the `content` key. They are a [memory view](https://docs.python.org/3/library/stdtypes.html#memory-views):\n",
     "\n",
     "```python\n",
     "[uploaded_file] = uploader.value\n",
@@ -1084,7 +1084,7 @@
     "    fp.write(uploaded_file[\"content\"])\n",
     "```\n",
     "\n",
-    "To convert the uploaded file into a Pandas dataframe, you need to convert it to a [BytesIO object](https://docs.python.org/3/library/io.html#binary-i-o):\n",
+    "To convert the uploaded file into a Pandas dataframe, you can use a [BytesIO object](https://docs.python.org/3/library/io.html#binary-i-o):\n",
     "\n",
     "```python\n",
     "import io\n",