doc: Fix broken link in readme.md

Changed link again to refer to the default branch ('master' at the
moment) HEAD and use -O instead of needlessly repeating the file name.

Authored-by: Md. Abdullah Al Maruf <62918360+mk1121@users.noreply.github.com>
Signed-off-by: Fini Jastrow <ulf.fini.jastrow@desy.de>

readme.md

@@ -276,15 +276,15 @@ git sparse-checkout add patched-fonts/JetBrainsMono
 
 ```sh
 mkdir -p ~/.local/share/fonts
-cd ~/.local/share/fonts && curl -fLo "Droid Sans Mono for Powerline Nerd Font Complete.otf" https://github.com/ryanoasis/nerd-fonts/raw/HEAD/patched-fonts/DroidSansMono/complete/Droid%20Sans%20Mono%20Nerd%20Font%20Complete.otf
+cd ~/.local/share/fonts && curl -fLO https://github.com/ryanoasis/nerd-fonts/raw/HEAD/patched-fonts/DroidSansMono/DroidSansMNerdFont-Regular.otf
 ```
 
 _Note:_ deprecated alternative paths: `~/.fonts`
 
 #### macOS (OS X)
 
 ```sh
-cd ~/Library/Fonts && curl -fLo "Droid Sans Mono for Powerline Nerd Font Complete.otf" https://github.com/ryanoasis/nerd-fonts/raw/HEAD/patched-fonts/DroidSansMono/complete/Droid%20Sans%20Mono%20Nerd%20Font%20Complete.otf
+cd ~/Library/Fonts && curl -fLO https://github.com/ryanoasis/nerd-fonts/raw/HEAD/patched-fonts/DroidSansMono/DroidSansMNerdFont-Regular.otf
 ```
 
 ### `Option 7: Unofficial Chocolatey or Scoop Repositories`