From your first link choose Index in the Source Code pane (far right). Choose misspellings/. Click on download to the right of speller. It will open with a text editor (like notepad++). It's also in the ZIP file.
If your workspace is public, it is accessible to anyone on the web without your login details. You can see the setting in CS50IDE -> Go To Your Dashboard.
I reserve the right to change/delete my answer if you discover that your workspace is public. Further, by no means am I suggesting that your workspace should be public. I believe it should be private.