docs: fix 2 URLs (#738)

* URL of image in Alttp ES tutorial
* Link to RA download in SMZ3 EN tutorial

worlds/alttp/docs/multiworld_es.md

@@ -144,7 +144,8 @@ Sólo hay que segiur estos pasos una vez.
 2. Ve a Ajustes --> Interfaz de usario. Configura "Mostrar ajustes avanzados" en ON.
 3. Ve a Ajustes --> Red. Configura "Comandos de red" en ON. (Se encuentra bajo Request Device 16.) Deja en 55355 (el
    default) el Puerto de comandos de red.
-![Captura de pantalla del ajuste Comandos de red](/static/assets/tutorial/retroarch-network-commands-en.png)
+
+![Captura de pantalla del ajuste Comandos de red](/static/generated/docs/A%20Link%20to%20the%20Past/retroarch-network-commands-en.png)
 4. Ve a Menú principal --> Actualizador en línea --> Descargador de núcleos. Desplázate y selecciona "Nintendo - SNES /
    SFC (bsnes-mercury Performance)".
 

worlds/smz3/docs/multiworld_en.md

@@ -10,9 +10,8 @@
     - An emulator capable of connecting to SNI such as:
         - snes9x Multitroid
           from: [snes9x Multitroid Download](https://drive.google.com/drive/folders/1_ej-pwWtCAHYXIrvs5Hro16A1s9Hi3Jz),
-        - BizHawk from: [BizHawk Website](http://tasvideos.org/BizHawk.html)
-        - RetroArch 1.10.3 or newer from: [RetroArch BuildBot Website](https://buildbot.libretro.com/) - nightly builds
-          are required until 1.10.3 is released. Or,
+        - BizHawk from: [BizHawk Website](http://tasvideos.org/BizHawk.html), or
+        - RetroArch 1.10.3 or newer from: [RetroArch Website](https://retroarch.com?page=platforms). Or,
     - An SD2SNES, FXPak Pro ([FXPak Pro Store Page](https://krikzz.com/store/home/54-fxpak-pro.html)), or other
       compatible hardware
 - Your legally obtained Super Metroid ROM file, probably named `Super Metroid (Japan, USA).sfc` and