samsung : Adding M31s, M31, M21 & A51

Change-Id: I9146ef3bcae43cba3e4e70ee9314328621621c77
diff --git a/_samsung/samsunggalaxya51.markdown b/_samsung/samsunggalaxya51.markdown
old mode 100755
new mode 100644
index 765030e..cfb3369
--- a/_samsung/samsunggalaxya51.markdown
+++ b/_samsung/samsunggalaxya51.markdown
@@ -4,11 +4,10 @@
 codename: a51
 downloadfolder: a51
 supportstatus: Current
-maintainer: roynatech2544
+maintainer: Galaxieo
 devicetree: "https://github.com/TeamWin/android_device_samsung_a51"
 oem: Samsung
 ddof: "/dev/block/platform/13520000.ufs/by-name/recovery"
-xdathread: "https://forum.xda-developers.com/t/recovery-unofficial-twrp-3-7-0-for-galaxy-a51-4g.4558645/"
 ---
 
 {% include disclaimer.html %}