Add warnings about incompatibility with OAuth 2.0 to endpoints that use UIA

Signed-off-by: Kévin Commaille <zecakeh@tedomum.fr>

data/api/client-server/administrative_contact.yaml

@@ -201,6 +201,11 @@ paths:
 
         Homeservers should prevent the caller from adding a 3PID to their account if it has
         already been added to another user's account on the homeserver.
+
+        {{% boxes/warning %}}
+        Since this endpoint uses UIA, it cannot be used when the access token was obtained
+        via the [OAuth 2.0 API](/client-server-api/#oauth-20-api).
+        {{% /boxes/warning %}}
       operationId: add3PID
       security:
         - accessTokenQuery: []

data/api/client-server/cross_signing.yaml

@@ -39,6 +39,11 @@ paths:
         they already exist. Allowing clients to upload the same set of keys more than once
         makes this endpoint idempotent in the case where the response is lost over the network,
         which would otherwise cause a UIA challenge upon retry.
+
+        {{% boxes/warning %}}
+        When this endpoint requires UIA, it cannot be used when the access token was obtained
+        via the [OAuth 2.0 API](/client-server-api/#oauth-20-api).
+        {{% /boxes/warning %}}
       operationId: uploadCrossSigningKeys
       security:
         - accessTokenQuery: []

data/api/client-server/device_management.yaml

@@ -137,6 +137,11 @@ paths:
         This API endpoint uses the [User-Interactive Authentication API](/client-server-api/#user-interactive-authentication-api).
 
         Deletes the given device, and invalidates any access token associated with it.
+
+        {{% boxes/warning %}}
+        Since this endpoint uses UIA, it cannot be used when the access token was obtained
+        via the [OAuth 2.0 API](/client-server-api/#oauth-20-api).
+        {{% /boxes/warning %}}
       operationId: deleteDevice
       security:
         - accessTokenQuery: []
@@ -189,6 +194,11 @@ paths:
         This API endpoint uses the [User-Interactive Authentication API](/client-server-api/#user-interactive-authentication-api).
 
         Deletes the given devices, and invalidates any access token associated with them.
+
+        {{% boxes/warning %}}
+        Since this endpoint uses UIA, it cannot be used when the access token was obtained
+        via the [OAuth 2.0 API](/client-server-api/#oauth-20-api).
+        {{% /boxes/warning %}}
       operationId: deleteDevices
       security:
         - accessTokenQuery: []