docs: update tokens processed badge to 20T (#843)

Signed-off-by: Nabin Mulepati <nmulepati@nvidia.com>

Author: nabinchha

README.md

@@ -2,7 +2,7 @@
 
 [![CI](https://github.com/NVIDIA-NeMo/DataDesigner/actions/workflows/ci.yml/badge.svg)](https://github.com/NVIDIA-NeMo/DataDesigner/actions/workflows/ci.yml)
 [![License](https://img.shields.io/badge/License-Apache_2.0-blue.svg)](https://opensource.org/licenses/Apache-2.0)
-[![Python 3.10 - 3.14](https://img.shields.io/badge/🐍_Python-3.10_|_3.11_|_3.12_|_3.13_|_3.14-blue.svg)](https://www.python.org/downloads/) [![NeMo Platform](https://img.shields.io/badge/NeMo-Platform-76b900)](https://docs.nvidia.com/nemo-platform/documentation/design-synthetic-data) [![Code](https://img.shields.io/badge/Code-Documentation-8A2BE2.svg)](https://docs.nvidia.com/nemo/datadesigner/) ![Tokens](https://img.shields.io/badge/10T+-Tokens_Processed-76b900.svg?logo=nvidia&logoColor=white)
+[![Python 3.10 - 3.14](https://img.shields.io/badge/🐍_Python-3.10_|_3.11_|_3.12_|_3.13_|_3.14-blue.svg)](https://www.python.org/downloads/) [![NeMo Platform](https://img.shields.io/badge/NeMo-Platform-76b900)](https://docs.nvidia.com/nemo-platform/documentation/design-synthetic-data) [![Code](https://img.shields.io/badge/Code-Documentation-8A2BE2.svg)](https://docs.nvidia.com/nemo/datadesigner/) ![Tokens](https://img.shields.io/badge/20T+-Tokens_Processed-76b900.svg?logo=nvidia&logoColor=white)
 
 **Generate high-quality synthetic datasets from scratch or using your own seed data.**