Problem:
Deduplicating LSP locations in the default handler changes list behavior for every user, while some configurations may intentionally return matching locations from multiple clients.
Solution:
Document how users can deduplicate locations in an on_list handler with vim.list.unique().
Co-authored-by: Deepak kudi <deepakkudi23@adsl-172-10-9-116.dsl.sndg02.sbcglobal.net>
Co-authored-by: Puneet Dixit <236133619+puneetdixit200@users.noreply.github.com>