tweak Assignments wording

Author: afeld

assignments.md

@@ -45,7 +45,7 @@ You'll create your own notebook.
 - Keep each cell to only a few lines of code.
   - Allows/encourages you to output intermediate results, ensuring that everything is working as expected.
 - You are always welcome to **add cells**. You probably don't want more than a few lines of code in each. This makes the spot checking of intermediate results easier.
-- Make notebooks [idempotent](https://en.wikipedia.org/wiki/Idempotence)
+- Make notebooks [idempotent](https://en.wikipedia.org/wiki/Idempotence).
   - Makes your work reproducible.
   - Use `Restart session and run all` (⏩ button in toolbar).
 
@@ -54,10 +54,10 @@ You'll create your own notebook.
 1. Ensure all the outputs are visible and the notebook is cleaned up.
    - This is a good time to run the notebook end-to-end with `Restart session and run all`.
    - See [general scoring criteria](syllabus.md#assignment-scoring).
-1. Ensure the notebook doesn't contain any sensitive information. (Only really applicable to [open-ended assignments](assignments/open_ended.md).)
+1. Ensure the notebook doesn't contain any sensitive information. (Only really applicable to [open-ended assignments](assignments/open_ended.md).) This might include:
    - API keys
-   - Personally-identifiable information (PII)
-1. `Download as .ipynb` and `.py` (two files).
+   - Personally-identifiable information (PII; data about individuals)
+1. `Download .ipynb` and `.py` (two files).
 
    ![Click the Colab File menu, Download, then Download as .ipynb and Download as .py](extras/img/download_notebook.png)
 
@@ -82,7 +82,7 @@ You'll create your own notebook.
 - **In a visualization, the values are out of order along the axis, or you're seeing vertical/zig-zag-y lines:** Make sure that:
   - The values are integers/floats/[timestamps](https://plotly.com/python/line-charts/#line-plots-on-date-axes), not strings, where applicable.
   - [Line charts: The column used for the X axis is sorted.](https://plotly.com/python/line-charts/#data-order-in-line-charts)
-- **`AttributeError: partially initialized module 'orjson' has no attribute 'OPT_NON_STR_KEYS'`:** Add the following cell before your other Plotly code, then `Restart session and run all`.
+- [**`AttributeError: partially initialized module 'orjson' has no attribute 'OPT_NON_STR_KEYS'`:**](https://github.com/plotly/plotly.py/issues/3567) Add the following cell before your other Plotly code, then `Restart session and run all`.
 
   ```python
   import plotly.io