Correct typo of defaults for docs property sorting

Test: manual
Change-Id: Iaca7ba51ca658529dacd2a324412964b2732c4b4
diff --git a/cmd/soong_build/writedocs.go b/cmd/soong_build/writedocs.go
index 9424b6c..c136846 100644
--- a/cmd/soong_build/writedocs.go
+++ b/cmd/soong_build/writedocs.go
@@ -44,7 +44,7 @@
 	"name":             0,
 	"src":              1,
 	"srcs":             2,
-	"defautls":         3,
+	"defaults":         3,
 	"host_supported":   4,
 	"device_supported": 5,
 }