[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The comment became outdated: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#106916

X-original-commit: fe90329ee32f9608c143a9fd658fe2a00712f9e4
Signed-off-by: Quentin Smetz (qsm) <qsm@odoo.com>

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

@@ -5,7 +5,7 @@
 // for your website, check the 'user_custom_rules.scss' file you can also edit.
 // /!\
 //
-// You can change the value of a variable you can find in the bootstrap 4
+// You can change the value of a variable you can find in the bootstrap 5
 // documentation (or in the file /web/static/lib/bootstrap/scss/_variables.scss)
 // and Odoo will automatically adapt its design to your new bootstrap. For
 // example, doing this will make some shadows and gradients appear, especially
@@ -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.
 //