[Docs Fix: ]QEFFAutoModelForImageTextToText Typing mistake Resolved (quic#357)

This PR is created for resolving a typing mistake in the name of
`QEFFAutoModelForImageTextToText ` in the `validate.md`

Signed-off-by: Abukhoyer Shaik <[email protected]>
Signed-off-by: eplatero <[email protected]>

Author: abukhoy

docs/source/validate.md

@@ -55,7 +55,7 @@
 ## Multimodal Language Models
 
 ### Vision-Language Models (Text + Image Generation)
-**QEff Auto Class:** `QEFFAutoModelImageTextToText`
+**QEff Auto Class:** `QEFFAutoModelForImageTextToText`
 
 | Architecture                | Model Family | Representative Models                  |
 |-----------------------------|--------------|----------------------------------------|