Update Quick Start Guide

Update by convert-ly to 2.19.7
Shifted emphasis away from Windows to be more general
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Many minor changes of punctuation and spelling
Isn't it more a function of the keyboard layout, Jan? Again, I'm thinking our audience is more likely to be comfortable with computer applications than not, and definitely more familiar with their keyboard layout. Most keyboards would have it as shift - (whatever that key is left of the 1), but that key on my system has 5 characters, so I'd rather not get too specific.