scripts/run-cbt.sh: correct script option usage

Signed-off-by: Changcheng Liu <changcheng.liu@aliyun.com>

diff --git a/src/script/run-cbt.sh b/src/script/run-cbt.sh
index e7feda308038fc3b13d3690cb85b87105eef2cdc..f238cac7d1fb8f087325f4718ce14ca6b675ee12 100755 (executable)
--- a/src/script/run-cbt.sh
+++ b/src/script/run-cbt.sh
@@ -10,7 +10,7 @@ usage:
 options:
   -a,--archive-dir    directory in which the test result is stored, default to $PWD/cbt-archive
   --build-dir         directory where CMakeCache.txt is located, default to $PWD
-  --cbt-dir           directory of cbt if you have already a copy of it. ceph/cbt:master will be cloned from github if not specified
+  --cbt               directory of cbt if you have already a copy of it. ceph/cbt:master will be cloned from github if not specified
   -h,--help           print this help message
   --source-dir        the path to the top level of Ceph source tree, default to $PWD/..
   --use-existing      do not setup/teardown a vstart cluster for testing