boards: efr32_radio: Update outdated links

This commit updates the outdated schematic and product links for the
efr32_radio boards.

Signed-off-by: Stephanos Ioannidis <[email protected]>

Author: stephanosio

boards/arm/efr32_radio/doc/brd4104a.rst

@@ -120,4 +120,4 @@ Reset the board and you should see the following message in the terminal:
    https://www.silabs.com/documents/public/reference-manuals/brd4104a-rm.pdf
 
 .. _EFR32BG13-BRD4104A Schematics:
-   https://www.silabs.com/documents/public/schematic-files/EFR32BG13-BRD4104A-A00-schematic.pdf
+   https://www.silabs.com/documents/public/schematic-files/BRD4104A-A00-schematic.pdf

boards/arm/efr32_radio/doc/brd4250b.rst

@@ -101,7 +101,7 @@ Reset the board and you should see the following message in the terminal:
 
 
 .. _EFR32FG1 Website:
-   https://www.silabs.com/products/wireless/proprietary/efr32-flex-gecko-2-4-ghz-sub-ghz
+   https://www.silabs.com/wireless/proprietary/efr32fg1-series-1-sub-ghz-2-4-ghz-socs
 
 .. _EFR32FG1 Datasheet:
    https://www.silabs.com/documents/public/data-sheets/efr32fg1-datasheet.pdf
@@ -119,4 +119,4 @@ Reset the board and you should see the following message in the terminal:
    https://www.silabs.com/documents/public/reference-manuals/brd4250b-rm.pdf
 
 .. _EFR32FG1-BRD4250B Schematics:
-   https://www.silabs.com/documents/public/schematic-files/efr32fg1-brd4250b-b02-schematic.pdf
+   https://www.silabs.com/documents/public/schematic-files/BRD4250B-B02-schematic.pdf

boards/arm/efr32_radio/doc/index.rst

@@ -179,7 +179,7 @@ Reset the board and you should see the following message in the terminal:
    https://www.silabs.com/documents/public/user-guides/ug385-brd4180a-user-guide.pdf
 
 .. _WSTK Main Board BRD4001A Schematics:
-   https://www.silabs.com/documents/public/schematic-files/WSTK-Main-BRD4001A-A01-schematic.pdf
+   https://www.silabs.com/documents/public/schematic-files/BRD4001A-A01-schematic.pdf
 
 .. _J-Link:
    https://www.segger.com/jlink-debug-probes.html