doc/cephfs/experimental-features: fix Mantle section header

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

diff --git a/doc/cephfs/experimental-features.rst b/doc/cephfs/experimental-features.rst
index 1dc781a11f05b778d052cc0dc3c0e903286dc16f..2f627c7374a51f65fa940b0829eb56e1defaf5ca 100644 (file)
--- a/doc/cephfs/experimental-features.rst
+++ b/doc/cephfs/experimental-features.rst
@@ -23,10 +23,8 @@ failures within it are unlikely to make non-inlined data inaccessible
 Inline data has always been off by default and requires setting
 the "inline_data" flag.
 
-
-
 Mantle: Programmable Metadata Load Balancer
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+-------------------------------------------
 
 Mantle is a programmable metadata balancer built into the MDS. The idea is to
 protect the mechanisms for balancing load (migration, replication,