This template duplicates Template:Tl for technical reasons. See the documentation on that page.
Why this template exists
The various succession box templates are considered navigational content and thus are excluded from print in the PDFs and printed books. However, Template:Tl can be used to end any table, thus that template cannot be excluded from print. However, Template:Tl can be excluded without any negative repercussions. Similar templates that are unambiguously the end of tables which should be excluded in print should redirect here, rather than to Template:Tl.
If you see any succession template ending with Template:Tl, please change it to Template:Tl.