Here is a video showing the difference between how a screen reader reads aloud a web page which has inaccessible hyperlink text and one with accessible hyperlink text.
"If you want to link to something that isn’t a web page—such as a Word document, Excel file, or PDF—you should include this information in the link text." from
This is important because it informs the user what will happen when they click on the link, thus preventing confusion. In addition, a user may decide not to click on a link if they know it’s a certain file type. This typically happens when a user doesn’t have the software needed to open the file or when they know the file type is inaccessible to them.
Example: B.C. Open Textbooks Review Rubric [Word file]
Sources:
https://webaim.org/techniques/hypertext/hypertext_links#non_html
https://opentextbc.ca/accessibilitytoolkit/
To add a link in Gutenberg:
To add a link with meaningful text in LibGuides:
Select "Link" from the drop-down menu
If you add a link in a Rich Text/HTML box