typo (#783)

examples/regression/train.conf

@@ -56,7 +56,7 @@ num_leaves = 31
 # alias: tree
 tree_learner = serial
 
-# number of threads for multi-threading. One thread will use one CPU, defalut is setted to #cpu. 
+# number of threads for multi-threading. One thread will use one CPU, default is setted to #cpu. 
 # num_threads = 8
 
 # feature sub-sample, will random select 80% feature to train on each iteration