fix(genapi): tutorial to deploy openwebui (scaleway#4952)

Author: fpagny

tutorials/deploy-openwebui-with-generative-apis/index.mdx

@@ -141,7 +141,11 @@ $ scw container container create name=open-webui \
     environment-variables.OPENAI_API_BASE_URL="https://api.scaleway.ai/<YOUR_PROJECT_ID>/v1" \
     secret-environment-variables.0.key="OPENAI_API_KEY" \
     secret-environment-variables.0.value="<YOUR_SECRET_KEY>" \
-    region=fr-par
+    region=fr-par \
+    cpu-limit=1000 \
+    memory-limit=4000 \
+    local-storage-limit=10000 \
+    timeout=600s
 ```
 
    <Message type="note">