doc: drop btrfs value judgment

Probably not a good idea to claim that btrfs is the ideal filesystem choice for
Ceph, especially since the same document (several paragraphs above this line)
is very reserved in its assessment of btrfs.

Signed-off-by: Nathan Cutler <ncutler@suse.com>

doc/rados/configuration/filesystem-recommendations.rst

@@ -92,8 +92,7 @@ capability means that ``btrfs`` can support snapshots that are writable.
 ``btrfs`` also incorporates multi-device management into the file system,
 which enables you to support heterogeneous disk storage infrastructure,
 data allocation policies. The community also aims to provide ``fsck``, 
-deduplication, and data encryption support in the future. This compelling 
-list of features makes ``btrfs`` the ideal choice for Ceph clusters.
+deduplication, and data encryption support in the future.
 
 .. _copy-on-write: http://en.wikipedia.org/wiki/Copy-on-write
 .. _compared: http://en.wikipedia.org/wiki/Comparison_of_file_systems