Update README.md

README.md

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 Only linux-64 packages are available at the moment.
 
 The default package contains GPU support, and is compatible with CUDA >= 11.8
-(driver  >= 520), and Volta or later GPU architectures. There are also CPU-only
+(driver >= 520), and Volta or later GPU architectures. There are also CPU-only
 packages available, which will be automatically selected when installing on a
 machine without GPUs available. See the build instructions at 
 https://nv-legate.github.io/cunumeric for details about manually forcing