Fix wrong link (T5 -> Flan-T5) on README

The link pointing to the flan-T5 docs is wrongly pointing to the (plain) T5 docs.

README.md

@@ -83,7 +83,7 @@ As mentioned in the first few lines of the abstract :
 - **Resources for more information:**
   - [Research paper](https://arxiv.org/pdf/2210.11416.pdf)
   - [GitHub Repo](https://github.com/google-research/t5x)
-  - [Hugging Face FLAN-T5 Docs (Similar to T5) ](https://huggingface.co/docs/transformers/model_doc/t5)
+  - [Hugging Face FLAN-T5 Docs (Similar to T5) ](https://huggingface.co/docs/transformers/model_doc/flan-t5)
 
 # Usage