devices: xiaomi: Add XDA Link for Redmi 3S & 4A

Change-Id: Ibc86a7fa2eaa6d41f8428130d2adf4a57f09bc4f
diff --git a/_xiaomi/xiaomiredmi3s.markdown b/_xiaomi/xiaomiredmi3s.markdown
index 5b51c0f..c54aaf8 100644
--- a/_xiaomi/xiaomiredmi3s.markdown
+++ b/_xiaomi/xiaomiredmi3s.markdown
@@ -8,6 +8,7 @@
 devicetree: https://github.com/TeamWin/android_device_xiaomi_land.git
 oem: Xiaomi
 ddof: "/dev/block/bootdevice/by-name/recovery"
+xdathread: "https://forum.xda-developers.com/xiaomi-redmi-3s/development/recovery-twrp-3-1-0-0-xiaomi-redmi-3s-t3585945"
 ---
 
 {% include disclaimer.html %}
diff --git a/_xiaomi/xiaomiredmi4a.markdown b/_xiaomi/xiaomiredmi4a.markdown
index 909c9aa..13dd906 100644
--- a/_xiaomi/xiaomiredmi4a.markdown
+++ b/_xiaomi/xiaomiredmi4a.markdown
@@ -8,6 +8,7 @@
 devicetree: https://github.com/TeamWin/android_device_xiaomi_rolex.git
 oem: Xiaomi
 ddof: "/dev/block/bootdevice/by-name/recovery"
+xdathread: "https://forum.xda-developers.com/redmi-4a/development/recovery-twrp-3-1-0-0-xiaomi-redmi-4a-t3576024"
 ---
 
 {% include disclaimer.html %}