doc: Added journal section placeholders. Definitions needed.

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

diff --git a/doc/config-cluster/journal-ref.rst b/doc/config-cluster/journal-ref.rst
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+++ b/doc/config-cluster/journal-ref.rst
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+=========
+ Journal 
+=========
+
+Journal
+=======
+
+``journal dio``
+
+:Description: 
+:Type: Boolean
+:Required: No
+:Default: ``true``
+
+
+``journal aio``
+
+:Description: 
+:Type: Boolean 
+:Required: No
+:Default: ``false``
+
+
+``journal block align``
+
+:Description: 
+:Type: Boolean
+:Required: No
+:Default: ``true``
+
+
+``journal max write bytes``
+
+:Description: 
+:Type: Integer
+:Required: No
+:Default: ``10 << 20``
+
+
+``journal max write entries``
+
+:Description: 
+:Type: Integer
+:Required: No
+:Default: ``100``
+
+
+``journal queue max ops``
+
+:Description: 
+:Type: Integer
+:Required: No
+:Default: ``500``
+
+
+``journal queue max bytes``
+
+:Description: 
+:Type: Integer
+:Required: No
+:Default: ``10 << 20``
+
+
+``journal align min size``
+
+:Description: Align data payloads greater than the specified minimum.
+:Type: Integer
+:Required: No
+:Default: ``64 << 10``
+
+
+``journal replay from``
+
+:Description: 
+:Type: Integer
+:Required: No
+:Default: ``0``
+
+
+``journal zero on create``
+
+:Description: 
+:Type: Boolean
+:Required: No
+:Default: ``false``
+
+
+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``