Update usage.rst: change Homebrew package name
Update usage.rst: change Homebrew package name
mojoBrendan/fmt,cppformat/cppformat,lightslife/cppformat,mojoBrendan/fmt,lightslife/cppformat,cppformat/cppformat,cppformat/cppformat,alabuzhev/fmt,lightslife/cppformat,alabuzhev/fmt,mojoBrendan/fmt,alabuzhev/fmt