doc: Added new journaler page to CephFS section. Needs descriptions.

Signed-off-by: John Wilkins <john.wilkins@inktank.com>

diff --git a/doc/cephfs/journaler.rst b/doc/cephfs/journaler.rst
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+===========
+ Journaler
+===========
+
+``journaler allow split entries``
+
+:Description: 
+:Type: Boolean
+:Required: No
+:Default: ``true``
+
+
+``journaler write ahead interval``
+
+:Description: 
+:Type: Integer
+:Required: No
+:Default: ``15``
+
+
+``journaler prefetch periods``
+
+:Description: 
+:Type: Integer
+:Required: No
+:Default: ``10``
+
+
+``journal prezero periods``
+
+:Description: 
+:Type: Integer
+:Required: No
+:Default: ``10``
+
+``journaler batch interval``
+
+:Description: Maximum additional latency in seconds we incur artificially. 
+:Type: Double
+:Required: No
+:Default: ``.001``
+
+
+``journaler batch max``
+
+:Description: Maximum bytes we'll delay flushing. 
+:Type: 64-bit Unsigned Integer 
+:Required: No
+:Default: ``0``