[diffusion] chore: refresh docs, retire stale knobs, and fix nightly attribution (#34663)

docs/cookbook/diffusion/intro.mdx

@@ -80,6 +80,12 @@ Video models denoise a bounded latent video sequence for each request. Use these
     href="/cookbook/diffusion/LTX/LTX2 & LTX2.3"
     img="/cards/logos/ltx.svg"
   />
+  <Card
+    title="SANA-Video"
+    mode="card"
+    href="/cookbook/diffusion/SANA-Video/SANA-Video"
+    img="/cards/logos/sana.png"
+  />
   <Card
     title="JoyAI-Echo"
     mode="card"
@@ -98,6 +104,12 @@ Video models denoise a bounded latent video sequence for each request. Use these
     href="/cookbook/diffusion/MiniMax/MiniMax-H3"
     img="/cards/logos/minimax.png"
   />
+  <Card
+    title="LingBot Video MoE"
+    mode="card"
+    href="/cookbook/diffusion/LingBot-Video/LingBot-Video-MoE"
+    img="/cards/logos/inclusionai.png"
+  />
 </CardGroup>
 
 ## Realtime / World Models