bpo-46130: [docs] Add anchor for whatsnew/3.10 type hint section (GH-30199)

This allows the title to be translated to other languages without linking problems.
(cherry picked from commit 3d3615f41f4ea73fe6707eb3673dfab482cb6a2b)

Co-authored-by: Rafael Fontenelle <rffontenelle@users.noreply.github.com>