fts documentation is misleading of its behaviour

[softmarshmallow]

Improve documentation

Link

https://supabase.com/docs/guides/database/full-text-search?queryGroups=language&language=js#match-any-search-words

Describe the problem

Says,

Notice how searching for big includes results with the word bigger (or biggest, etc).

But actually it does not return "biggest" for "big" (related - https://github.com/orgs/supabase/discussions/5435)