Prepare the release notes for v0.10.0 release

Signed-off-by: Leandro Lucarella <[email protected]>

Author: llucax

RELEASE_NOTES.md

@@ -2,12 +2,10 @@
 
 ## Summary
 
-
+This release includes quite a few enhancements and bug fixes for the cookiecutter template, but most importantly a new script for migrating to new templates, generating the templates is no longer needed for upgrading.
 
 ## Upgrading
 
-<!-- Here goes notes on how to upgrade from previous versions, including deprecations and what they should be replaced with -->
-
 ### Cookiecutter template
 
 - A new script for migrating to new templates (instead of regenerating all files) is provided. It can't handle the upgrade 100% automatically, but should make the migration process much easier and less error prone.
@@ -28,10 +26,6 @@
 
 - A new GitHub ruleset is provided to configure the merge queue, so branch protection rules are not needed anymore.
 
-### Cookiecutter template
-
-<!-- Here new features for cookiecutter specifically -->
-
 ## Enhancements
 
 - The generated docs now show the symbol type in the table of contents.