Remove dtype from where() type annotation

Author: asmeurer

spec/API_specification/searching_functions.md

@@ -90,7 +90,7 @@ Returns elements chosen from `x1` or `x2` depending on `condition`.
 
 #### Parameters
 
--   **condition**: _<array<bool>>_
+-   **condition**: _<array>_
 
     -   when `True`, yield `x1_i`; otherwise, yield `x2_i`. Must be compatible with `x1` and `x2` (see {ref}`broadcasting`).