Use download role for schema

Signed-off-by: Filipe Laíns <[email protected]>

Author: FFY00

source/specifications/build-details/index.rst

@@ -46,7 +46,7 @@ v1.0
       - :ref:`build-details-v1.0`
 
     * - Schema
-      - https://packaging.python.org/en/latest/specifications/schemas/python-build-info-v1.0.schema.json
+      - :download:`https://packaging.python.org/en/latest/specifications/schemas/build-details-v1.0.schema.json <../schemas/build-details-v1.0.schema.json>`
 
 
 - Initial version, introduced by :pep:`739`.