fix alignment of comment in bash script snippet

Readme.md

@@ -115,6 +115,6 @@ On GNU compatible system this is equivalent to:
 
 ```bash
 stow -d "$DOTFILES_DIR/ssh" -t "/home/$USER" user
-stow -d "$DOTFILES_DIR/ssh" -t / system             # needs root permissions obviously
+stow -d "$DOTFILES_DIR/ssh" -t / system # needs root permissions obviously
 ```