[ADD] example of authorship info at bottom of document

accounting/adviser/assets_management.rst

@@ -154,3 +154,8 @@ invoice.
 
    #. remove all "Red" lines
    #. create a new line that deprecate the whole residual value
+
+.. rst-class:: text-muted
+
+| Written by Fabien Pinckaers (https://odoo.com)
+| Proofread by Laurence Henrion, Antony Lesuisse