boards: silabs: siwx917: Fix datasheet URL

The current datasheet URL gives a 404. Update it to the correct location.

Signed-off-by: Johan Hedberg <[email protected]>

Author: jhedberg

boards/silabs/radio_boards/siwx917_rb4338a/doc/index.rst

@@ -107,7 +107,7 @@ the board.
    https://www.silabs.com/wireless/wi-fi/siwx917-wireless-socs
 
 .. _SiWG917 Datasheet:
-   https://www.silabs.com/documents/public/data-sheets/siw917x-datasheet.pdf
+   https://www.silabs.com/documents/public/data-sheets/siwg917-datasheet.pdf
 
 .. _SiWG917 Reference Manual:
    https://www.silabs.com/documents/public/reference-manuals/siw917x-family-rm.pdf