update usage

sections/usage.md

@@ -1,4 +1,4 @@
-- This demo loads the `FlaxCLIPVisionMBartforConditionlGeneration` present in the `model` directory of this repository. The checkpoint is loaded from `ckpt/ckpt-49499` which is pre-trained checkpoint with 70k steps. 100 random validation set examples are present in the `references.tsv` with respective images in the `images` directory.
+- This demo loads the `FlaxCLIPVisionMBartforConditionlGeneration` present in [official model repo] (https://huggingface.co/flax-community/clip-vit-base-patch32_mbart-large-50). 100 random validation set examples are present in the `references.tsv` with respective images in the `images` directory.
 
 - We provide `English Translation` of the generated caption and reference captions for users who are not well-acquainted with the other languages. This is done using `mtranslate` to keep things flexible enough and needs internet connection as it uses the Google Translate API. We will also add the original captions soon.