* docs/grub.texi (Simple configuration): Document GRUB_CMDLINE_XEN
and GRUB_CMDLINE_XEN_DEFAULT. Recommend setting GRUB_GFXPAYLOAD_LINUX=text rather than unsetting it in order to disable gfxpayload. (Shell-like scripting): Add real content. (Serial terminal): Suggest `terminal_input serial; terminal_output serial' rather than putting the two commands on separate lines, since console input will be inoperative after the first command. (menuentry): Document --class, --users, and --hotkey options. (terminfo): Describe what `visually-ordered UTF-8' means (thanks, Vladimir Serbinenko).
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