[FIX] contributing: dead idiomatic python link

The link replaced is dead and doesn't lead to anything anymore. The new link is
the exact same page but hosted on another website.

content/contributing/development/coding_guidelines.rst

@@ -575,7 +575,7 @@ So, you can write ``if some_collection:`` instead of ``if len(some_collection):`
 - As a good developer, document your code (docstring on methods, simple
   comments for tricky part of code)
 - In additions to these guidelines, you may also find the following link
-  interesting: http://python.net/~goodger/projects/pycon/2007/idiomatic/handout.html
+  interesting: https://david.goodger.org/projects/pycon/2007/idiomatic/handout.html
   (a little bit outdated, but quite relevant)
 
 Programming in Odoo

content/developer/reference/cli.rst

@@ -92,15 +92,7 @@ Running the server
 
 .. option:: --upgrade-path <upgrade_path>
 
-   comma-separated list of directories from which additional upgrade scripts
-   are loaded.
-
-.. option:: --pre-upgrade-scripts <pre_upgrade_scripts>
-
-   comma-separated list of paths to upgrade scripts. The scripts are run before
-   loading base module when an upgrade of any module is requested. This is
-   useful to perform some actions during custom modules upgrade after a major
-   upgrade.
+   specify an additional upgrade path.
 
 .. option:: --load <modules>