doc: fix typo to auto scale pg number

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

diff --git a/doc/rados/operations/placement-groups.rst b/doc/rados/operations/placement-groups.rst
index 9a417117f9c63764c70fc6f20d433209a52f0c35..060c1f53d1bbe5e42a9eaa5f1f7af593f2b555a1 100644 (file)
--- a/doc/rados/operations/placement-groups.rst
+++ b/doc/rados/operations/placement-groups.rst
@@ -178,7 +178,7 @@ whether you specify a ``pg_num`` value or not does not affect whether
 the value is automatically tuned by the cluster after the fact.  To
 enable or disable auto-tuning,::
 
-  ceph osd pool set {pool-name} pg_autoscaler_mode (on|off|warn)
+  ceph osd pool set {pool-name} pg_autoscale_mode (on|off|warn)
 
 The "rule of thumb" for PGs per OSD has traditionally be 100.  With
 the additional of the balancer (which is also enabled by default), a