Fix misspelling

Change-Id: Iba8b33094829fb5da03cc683f5aacbdc4a71aede
diff --git a/_data/mirrors.yml b/_data/mirrors.yml
index 6056438..8e86c21 100644
--- a/_data/mirrors.yml
+++ b/_data/mirrors.yml
@@ -1,5 +1,5 @@
 - description: Primary (Recommended)
-  baserul: http://dl.twrp.me/
+  baseurl: http://dl.twrp.me/
 
 - description: Techerrata in Germany (may be out of date)
   baseurl: http://techerrata.com/browse/twrp2/