Linked documents always assumed to be PDF's

Howdy! I am testing the test Manual check: is the linked document accessible? and I believe I ran into a small bug.

Problem

The test seems to always assume that linked documents are PDF's even if they are not.

See, I just uploaded a Word document but the alert still provides recommendations about PDF's:

Steps to reproduce

1. Enable editoria11y module
2. Go to /admin/config/content/editoria11y
3. Under Advanced configuration expand Modify tests
4. Under Remind the editor that these linked documents need a manual check enable the test for Word documents and other file types by pasting the value suggested in the field description: a[href$='.pdf'], a[href*='.pdf?'], a[href$='.doc'], a[href$='.docx'], a[href*='.doc?'], a[href*='.docx?'], a[href$='.ppt'], a[href$='.pptx'], a[href*='.ppt?'], a[href*='.pptx?'], a[href^='https://docs.google']
5. Go to /node/add/page
6. Upload a Word document in the wysiwyg
7. Then you will get the screenshot above which refers to the Word document as a PDF. I would have expected generic recommendations (or possibly recommendations specific to Word documents, if any) rather than recommendations that refer to the file as a PDF.

Proposed resolution

I believe this would have to be fixed in the JS library.