First snapshot of trytond documentation refactoring

doc/topics/views/extension.rst

 .. _topics-extension:
 
-===========
-Extend view
-===========
+==============
+Extending View
+==============
 
-Extend a view means, that the original view will be modified by a set of rules
-that are defined with XML.
+Extending a view means, that the original view will be modified by a set of
+rules which are defined with XML.
 
 For this purpose, the extension engine uses xpath expressions.
 
 The view is defined with the field ``inherit`` of the ir.ui.view.
 
 If the field ``domain`` (a Python string representation of a :ref:`domain
 <topics-domain>`) is not set or evaluated to True, the inheritance will be
 proceeded.
 
-XML description
+XML Description
 ===============
 
 data
 ----
 
 Each view must start with this tag.
 
 xpath
 -----
 
@@ skipping 15 matching lines @@
           expr="/form/notebook/page/separator[@name=&quot;signature&quot;]"
           position="before">
           <label name="main_company"/>
           <field name="main_company"/>
           <label name="company"/>
           <field name="company"/>
           <label name="employee"/>
           <field name="employee"/>
       </xpath>
   </data>