Add additional information about the Godot XR Vendor Plugin

Author: BastiaanOlij

tutorials/xr/deploying_to_android.rst

@@ -51,6 +51,12 @@ file into your projects `addons` folder.
 
 You can find the main repository of the vendors plugin `here <https://github.com/GodotVR/godot_openxr_vendors>`__.
 
+.. note::
+    From Godot 4.6 onwards, the vendor plugin is now an optional but recommended plugin.
+    Godot can export directly to most Android-compatible devices.
+    This can be useful for demonstration and tutorial projects where a single APK can be deployed to multiple devices.
+    The vendor plugin unlocks vendor specific implementations and settings, and may be required to release on app stores.
+
 Creating the export presets
 ---------------------------
 You will need to setup a separate export preset for each device, as each device will need its own loader included.
@@ -59,12 +65,12 @@ Open **Project** and select **Export..**.
 Click on **Add..** and select **Android**.
 Next change the name of the export preset for the device you're setting this up for, say **Meta Quest**.
 And enable **Use Gradle Build**.
+Next change the **XR Mode** to **OpenXR**.
 If you want to use one-click deploy (described below), ensure that **Runnable** is enabled.
 
-If the vendors plugins were installed correctly you should find entries for the
-different headsets under **XR Features**. Change the **XR Mode** to **OpenXR**, then
-select the entry for your headset if you see one. If you don't see one enable the
-Khronos plugin.
+If you've installed the vendor plugin you will also find entries for the different headsets under **XR Features**.
+Select the entry for your headset, if you see one.
+Otherwise, enable the Khronos plugin.
 
 .. image:: img/android_meta_quest.webp
 

tutorials/xr/xr_next_steps.rst

@@ -9,6 +9,17 @@ Now that we have the basics covered there are several options to look at for you
 * You can look at a number of `XR demos here <https://github.com/godotengine/godot-demo-projects/tree/master/xr>`_.
 * You can find 3rd party tutorials on our :ref:`Tutorials and resources <doc_community_tutorials>` page.
 
+Godot XR vendor plugin
+----------------------
+
+The vendor plugin isn't just for ref:`deploying to Android <doc_deploying_to_android>`.
+In the vendor plugin, we implement many OpenXRs vendor extensions that unlock unique features on certain devices,
+or features that are new enough that a standardised implementation is not available yet.
+
+Together with the OpenXR working group we maintain a 
+`client support matrix <https://github.khronos.org/OpenXR-Inventory/extension_support.html#client_matrix>`_ that lists
+all the OpenXR extensions Godot supports and whether they require the vendor plugin.
+
 XR Toolkits
 -----------