[Task] Add caution section for compose require

doc/01_Setup.md

@@ -44,7 +44,7 @@ Bugfix versions of Pimcore modules can be installed within a Platform Version vi
 
 - Carefully read our [Release Notes](./03_Release_Notes/README.md) before any update.
 - Update to a new Pimcore Platform version: 
-  - if you want to stick to a specific version, use the command `composer require pimcore/platform-version:2023.1`.
+  - if you want to update to a specific version, use the command `composer require pimcore/platform-version:2023.1 --no-update` to update your `composer.json`. Afterwards run `composer update`.
   - if you want to update to the latest version (and the constraint in your `composer.json` allows further updates), 
     use the command `composer update pimcore/platform-version`.
 
@@ -54,6 +54,16 @@ Eventually adding `pimcore/*` is necessary for composer to resolve pimcore repos
 
 :::
 
+:::caution
+
+Keep in mind that the `pimcore/platform-version` repository does not specify required packages.  
+It only specifies conflicting packages to ensure compatible versions are installed.
+The command `composer require pimcore/platform-version --update-with-all-dependencies` will therefore not work.
+The command `composer require` will check against your `composer.lock` and may result in an error.
+You need to run `composer update` to update all packages to the latest version.
+
+:::
+
 :::warning
 
 It might be necessary to update a specific Pimcore module to a version that is not included in the Platform Version.