Add Microsoft DevAzure Server notes (#2851)

Add a note to the Azure Devops oauth setup page that the Server version does not support oAuth 2.
Modify the description of the Organization annotation in the Personal Access Token setup page.

Author: vinokurig

modules/administration-guide/pages/configuring-oauth-2-for-microsoft-azure-devops-services.adoc

@@ -16,6 +16,9 @@ pass:[<!-- vale RedHat.Spelling = YES -->]
 . Set up the Microsoft Azure DevOps Services OAuth App (OAuth 2.0).
 . Apply the Microsoft Azure DevOps Services OAuth App Secret.
 
+[IMPORTANT]
+OAuth 2.0 isn't supported on Azure DevOps Server, see link:https://learn.microsoft.com/en-us/azure/devops/integrate/get-started/authentication/oauth?view=azure-devops[the documentation page].
+
 include::partial$proc_setting-up-the-microsoft-azure-devops-services-oauth-app.adoc[leveloffset=+1]
 
 include::partial$proc_applying-the-microsoft-azure-devops-services-oauth-app-secret.adoc[leveloffset=+1]

modules/end-user-guide/pages/using-a-git-provider-access-token.adoc

@@ -84,7 +84,7 @@ type: Opaque
 <1> Your {prod-short} user ID.
 <2> The Git provider name: `github` or `gitlab` or `bitbucket-server` or `azure-devops`.
 <3> The Git provider URL.
-<4> This line is only applicable to `azure-devops`: your Git provider user organization.
+<4> This line is only applicable to `azure-devops`: your Git provider user organization, or collection if Azure DevOps Server is used.
 
 . Visit `pass:c,a,q[{prod-url}]/api/kubernetes/namespace` to get your {prod-short} user namespace as `name`.
 
@@ -117,6 +117,23 @@ EOF
 ----
 ====
 
+[IMPORTANT]
+====
+If you are using Azure DevOps Server, you must also modify the xref:mounting-git-configuration.adoc[workspace's
+gitconfig] with the following section:
+```
+[http]
+    extraheader = "Authorization: Basic <base64-encoded(:personal-access-token)>"
+```
+To generate the key-value pair, use the following command:
+```
+echo -n "extraheader = \"Authorization: Basic "$(printf ":%s" <personal access token> | base64)\"
+```
+see link:https://learn.microsoft.com/en-us/azure/devops/repos/git/auth-overview?view=azure-devops&tabs=Linux#personal-access-tokens[the documentation page] for more information.
+
+The `extraheader` configuration is needed for remote git operations to Azure Devops Server, e.g. `git clone`. This authorization method has a higher priority over the git credentials store, and as a result, the remote operations to other Git providers will fail.
+====
+
 .Verification
 
 . xref:starting-a-workspace-from-a-git-repository-url.adoc[Start a new workspace by using the URL of a remote Git repository] that the Git provider hosts.