Merge pull request #927 from miaoyq/fix-description-for-pprof

Fix the description of cmd 'pprof threadcreate'

cmd/ctr/pprof.go

@@ -129,7 +129,7 @@ var pprofBlockCommand = cli.Command{
 
 var pprofThreadcreateCommand = cli.Command{
 	Name:  "threadcreate",
-	Usage: "goroutine blocking profile",
+	Usage: "goroutine thread creating profile",
 	Action: func(context *cli.Context) error {
 		client := getPProfClient(context)