Update build.sh

build.sh

@@ -1,6 +1,8 @@
 #!/bin/bash
-# this is a simple scrip to make xgboost in MAC nad Linux
+# this is a simple script to make xgboost in MAC nad Linux
 # basically, it first try to make with OpenMP, if fails, disable OpenMP and make again
+# This will automatically make xgboost for MAC users who do not have openmp support
+# In most cases, type make will give what you want
 if make; then
     echo "Successfully build multi-thread xgboost"
 else