[FIX] website: update comment in user_custom_bootstrap_overridden file

The comment became outdated:
- For 14.0 and above: mentioned the "Customize dialog" which does not
  exist anymore.
- For 16.0 and above: mentioned "Bootstrap 4" instead of "Bootstrap 5".

Related to opw-3056683

closes odoo/odoo#106836

X-original-commit: ed9a7832
Signed-off-by: Quentin Smetz (qsm) <qsm@odoo.com>

addons/website/static/src/scss/user_custom_bootstrap_overridden.scss

@@ -15,8 +15,9 @@
 // $enable-gradients: true;
 //
 // Notice that Odoo already overrides bootstrap variables according to your
-// choices in the "Customize Theme" dialog, you should first take a look at
-// it and do customizations this way. Indeed, if you overridde the same
-// variables, Odoo will either have to ignore them or not be able to make
-// the "Customize Theme" dialog work for these variables anymore.
+// choices via the website builder (especially 3rd tab of the editor panel). You
+// should first take a look at it and do customizations this way. Indeed, if you
+// override the same variables yourself, Odoo will either have to ignore them or
+// not be able to make the website builder work properly for these variables
+// anymore.
 //