fix(docs): internationalization middleware example (#55645)
- remove the slash before `pathname` (already included in the value).
- add `search` and `hash` values in redirected url:
- retains these values on redirect
- they already have `?` and `#` respectively
Co-authored-by: Balázs Orbán <18369201+balazsorban44@users.noreply.github.com>
