[FIX] doc: deprecated statusbar_color

Can still be mentionned in documentation but should not be used in example.

doc/reference/guidelines.rst

@@ -129,7 +129,7 @@ When declaring a record in XML,
         <field name="arch" type="xml">
             <tree>
                 <field name="my_field_1"/>
-                <field name="my_field_2" string="My Label" widget="statusbar" statusbar_visible="draft,sent,progress,done" statusbar_colors='{"invoice_except":"red","waiting_date":"blue"}' />
+                <field name="my_field_2" string="My Label" widget="statusbar" statusbar_visible="draft,sent,progress,done" />
             </tree>
         </field>
     </record>

doc/reference/views.rst

@@ -363,7 +363,7 @@ system. Available semantic components are:
     .. todo:: list of widgets
 
        & options & specific attributes (e.g. widget=statusbar
-       statusbar_visible statusbar_colors clickable)
+       statusbar_visible clickable)
   ``options``
     JSON object specifying configuration option for the field's widget
     (including default widgets)
@@ -502,13 +502,16 @@ The states are shown following the order used in the field (the list in a
 selection field, etc). States that are always visible are specified with the
 attribute ``statusbar_visible``.
 
-``statusbar_colors`` can be used to give a custom color to specific states.
+``statusbar_colors``
+    can be used to give a custom color to specific states.
+
+    .. deprecated:: 9.0
+
 
 ::
 
     <field name="state" widget="statusbar"
-        statusbar_visible="draft,sent,progress,invoiced,done"
-        statusbar_colors="{'shipping_except':'red','waiting_date':'blue'}"/>
+        statusbar_visible="draft,sent,progress,invoiced,done" />
 
 The Sheet
 '''''''''