Update README.md

src/pdlp/README.md

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 https://developer.nvidia.com/cuda-toolkit
 
-#### nvidia-smi Check drivers
+#### nvidia-smi check drivers
 
 To utilize the maximum potential of any hardware, relevant drivers for that hardware are installed onto the system. There exists a tool named “nvidia-smi” which helps to manage NVidia GPU hardware all through the terminal on the Linux operating system.