Set maximum sizes for digraphs

Between 1.5.6 and 1.6.5 of sphinx, the digraphs stopped being scaled to fit.
Add a maximum size to them to fix this.

Signed-off-by: Rob Herring <[email protected]>

Author: robherring

source/devicetree-basics.rst

@@ -47,6 +47,7 @@ with properties and values inside each node.
 
    rankdir = LR;
    ranksep = equally;
+   size = "6,8"
    node [ shape="Mrecord"; width="3.5"; fontname = Courier; ];
 
    "/" [ label = "\N |
@@ -153,6 +154,7 @@ identified by a forward slash (/).
 
    rankdir = LR;
    ranksep = equally;
+   size = "6,8"
    node [ shape="Mrecord"; width="2.5"; fontname = Courier; ];
 
    "/":e    -> "cpus":w
@@ -883,6 +885,7 @@ sits in the logical interrupt tree.
 
    rankdir = LR
    ranksep = "1.5"
+   size = "6,8"
    edge [ dir="none" ]
    node [ shape="Mrecord" width="2.5" ]
 

source/flattened-format.rst

@@ -24,6 +24,7 @@ will resemble the diagram in :numref:`figure_device_tree_structure`
 
    rankdir = LR
    ranksep = "1.5"
+   size = "6,8"
    edge [ dir="none" ]
    node [ shape="Mrecord" width="2.5" ]