[Doc] Update notes for H2O-VL and Gemma3 (#17219)

Signed-off-by: DarkLight1337 <tlleungac@connect.ust.hk>

docs/source/models/supported_models.md

@@ -1118,11 +1118,6 @@ See [this page](#generative-models) for more information on how to use generativ
 <sup>E</sup> Pre-computed embeddings can be inputted for this modality.  
 <sup>+</sup> Multiple items can be inputted per text prompt for this modality.
 
-:::{important}
-Pan-and-scan image pre-processing is currently supported on V0 (but not V1).
-You can enable it by passing `--mm-processor-kwargs '{"do_pan_and_scan": true}'`.
-:::
-
 :::{warning}
 Both V0 and V1 support `Gemma3ForConditionalGeneration` for text-only inputs.
 However, there are differences in how they handle text + image inputs:
@@ -1142,7 +1137,7 @@ This limitation exists because the model's mixed attention pattern (bidirectiona
 :::
 
 :::{note}
-`h2oai/h2ovl-mississippi-2b` will be available in V1 once we support backends other than FlashAttention.
+`h2oai/h2ovl-mississippi-2b` will be available in V1 once we support head size 80.
 :::
 
 :::{note}