docs: add B300 to the validated GPU list

B300 health-monitor UAT passed on AWS p6-b300.48xlarge (NKX-13436).

Signed-off-by: Rupali Shukla <rupalis@nvidia.com>

Author: rupalis-nv

docs/OVERVIEW.md

@@ -54,7 +54,7 @@ NVSentinel has been validated on the following NVIDIA GPU architectures:
 | Ampere | A100 |
 | Hopper | H100, H200 |
 | Ada Lovelace | L4 Tensor Core GPU, L40, L40S |
-| Blackwell | B200, GB200, GB300, RTX Pro 6000 |
+| Blackwell | B200, B300, GB200, GB300, RTX Pro 6000 |
 
 NVSentinel is designed to work with any GPU supported by the NVIDIA GPU Operator. Architectures and GPUs not listed above have not been formally validated but may work in your environment.