fix(admin/AI): Small additions

- Add FAQ section to AI Overview
- Add note to context chat that it's not possible to change the language model

Signed-off-by: Marcel Klehr <mklehr@gmx.net>

admin_manual/ai/app_context_chat.rst

@@ -71,6 +71,7 @@ Nextcloud customers should file bugs directly with our Customer Support.
 Known Limitations
 -----------------
 
+* The underlying language model used by Context Chat cannot be changed
 * We currently only support the English language
 * Language models are likely to generate false information and should thus only be used in situations that are not critical. It's recommended to only use AI at the beginning of a creation process and not at the end, so that outputs of AI serve as a draft for example and not as final product. Always check the output of language models before using it.
 * Make sure to test this app for whether it meets your use-case's quality requirements

admin_manual/ai/overview.rst

@@ -164,3 +164,15 @@ Backend apps
 ~~~~~~~~~~~~
 
 * :ref:`context_chat + context_chat_backend<ai-app-context_chat>` -  (Customer support available upon request)
+
+
+Frequently Asked Questions
+--------------------------
+
+Why is my prompt slow?
+^^^^^^^^^^^^^^^^^^^^^^
+
+Reasons for slow performance from a user perspective can be
+
+ * Using CPU processing instead of GPU (sometimes this limit is imposed by the used app)
+ * High user demand for the feature: User prompts and AI tasks are usually processed in the order they are received, which can cause delays when a lot of users access these features at the same time.