Nicer formatting for the PDU field documentation

specification/30_server_server_api.rst

@@ -110,8 +110,9 @@ receiving an "empty" transaction.)
 
 PDUs and EDUs
 -------------
-.. WARNING::
-  This section may be misleading or inaccurate.
+
+Common PDU Fields
+~~~~~~~~~~~~~~~~~
 
 All PDUs have:
  - An ID
@@ -121,24 +122,29 @@ All PDUs have:
    (regardless of which origin sent them)
 
 ``context``
++++++++++++
 Type:
   String
 Description:
   Event context identifier
 
+
 ``origin``
+++++++++++
 Type:
   String
 Description:
   DNS name of homeserver that created this PDU.
 
 ``pdu_id``
+++++++++++
 Type:
   String
 Description:
   Unique identifier for PDU within the context for the originating homeserver
 
 ``ts``
+++++++
 Type:
   Integer
 Description:
@@ -146,12 +152,14 @@ All PDUs have:
   created.
 
 ``pdu_type``
+++++++++++++
 Type:
   String
 Description:
   PDU event type.
 
 ``prev_pdus``
++++++++++++++
 Type:
   List of pairs of strings
 Description:
@@ -159,6 +167,7 @@ All PDUs have:
   homeserver was aware of for this context when it made this PDU.
 
 ``depth``
++++++++++
 Type:
   Integer
 Description:
@@ -169,45 +178,55 @@ All PDUs have:
   - Update this structure so that 'pdu_id' is a two-element [origin,ref] pair
     like the prev_pdus are
 
+State Update PDU Fields
+~~~~~~~~~~~~~~~~~~~~~~~
+
 For state updates:
 
 ``is_state``
+++++++++++++
 Type:
   Boolean
 Description:
   True if this PDU is updating state.
 
 ``state_key``
++++++++++++++
 Type:
   String
 Description:
   Optional key identifying the updated state within the context.
 
 ``power_level``
++++++++++++++++
 Type:
   Integer
 Description:
   The asserted power level of the user performing the update.
 
 ``required_power_level``
+++++++++++++++++++++++++
 Type:
   Integer
 Description:
   The required power level needed to replace this update.
 
 ``prev_state_id``
++++++++++++++++++
 Type:
   String
 Description:
   PDU event type.
 
 ``prev_state_origin``
++++++++++++++++++++++
 Type:
   String
 Description:
   The PDU id of the update this replaces.
 
 ``user_id``
++++++++++++
 Type:
   String
 Description: