Some doc updates (#16600)

* change screenshots and text to match the current Azure web ui

* add the --ignore-buildable switch to suppress the warning message that might be confusing

* add hint to docker-compose upgrade to use the newest repo

* fix enable EPEL insturctions for RHEL 9

docs/installation-and-operations/installation/packaged/README.md

@@ -191,7 +191,12 @@ sudo wget -O /etc/yum.repos.d/openproject.repo \
 If it is not already enabled, make sure to enable [Extra Packages for Enterprise Linux](https://fedoraproject.org/wiki/EPEL) (EPEL).
 
 ```shell
-sudo dnf install -y epel-release
+sudo subscription-manager repos --enable codeready-builder-for-rhel-9-$(arch)-rpms
+sudo dnf install https://dl.fedoraproject.org/pub/epel/epel-release-latest-9.noarch.rpm
+
+# if using CentOS 9:
+# sudo dnf config-manager --set-enabled crb
+# sudo dnf install https://dl.fedoraproject.org/pub/epel/epel{,-next}-release-latest-9.noarch.rpm
 ```
 
 Download the OpenProject package:

docs/installation-and-operations/operation/upgrading/README.md

@@ -97,11 +97,12 @@ If you want to perform changes to your configuration or are unsure what steps ar
 Note that this still takes previous values into consideration. Values that should not change from your previous configurations can be skipped by pressing `<Return>`. This also applies for steps with passwords, which are shown as empty even though they may have a value. Skipping those steps equals to re-use the existing value.
 
 ## Compose-based installation
+> **Note**: Please make sure the git repository with the docker-compose.yml file is up-to-date. If you're using an old version of the repository, the update might fail.
 
 When using the Compose-based docker installation, you can simply do the following:
 
 ```shell
-docker-compose pull
+docker-compose pull --ignore-buildable
 docker-compose up -d
 ```
 

docs/system-admin-guide/authentication/openid-providers/README.md

@@ -133,7 +133,7 @@ You can now click on "Certificates & secret".
 
 ![Azure Active Directory Certificates](06-certificates.png)
 
-Then click on "New client secret", set the description to "client_secret", and the expiration to "never". Then click on "Add".
+Then click on "New client secret", set the description to "client_secret", and the expiration to "730 days (24 months)". Then click on "Add".
 
 ![Azure Active Directory New Client Secret](07-client-secret.png)