Ha ha, you're right, in a way. It depends on whether you take G to mean the figure on the keyboard or the figure on the screen.
The figure on most keyboards is G. Yet when you press it, it puts on the screen, g. Chromebooks are better in this way. Their keyboards are labeled in lowercase.
I actually went back and forth between saying Shift-G, or just G, for this very reason. So I erred on the side of clarity.
I thought the way you wrote it was clear but these comments got me curious what the various conventions might be so I took a quick look at :help in Vim (since it lists an awful lot of key bindings). I'm now officially confused and don't think you can go too far wrong.
In some contexts :help notates things as characters (ex zh, zH, and z<CR>). In other cases I'm seeing things written as <S-F11> and <C-G>. There's also CTRL-H (instead of <C-H>) but I'm not seeing shift written out like that for whatever reason. Sometimes they get mixed (I'm not sure what the rules are) such as for hh<Space> and hh<C-]>. Amusingly enough, :help appears to treat Meta-{char} as case sensitive but CTRL-{char} as case insensitive (I assume there's a reason). I also spotted a <kPlus> (for the keypad).
The figure on most keyboards is G. Yet when you press it, it puts on the screen, g. Chromebooks are better in this way. Their keyboards are labeled in lowercase.
I actually went back and forth between saying Shift-G, or just G, for this very reason. So I erred on the side of clarity.