scripts/sphinx-pre-install: fix Arch xelatex dependency

On Arch Linux, xelatex is installed in the texlive-xetex package.

Signed-off-by: Li Hua <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Jonathan Corbet <[e-mail]>

scripts/sphinx-pre-install

···
 		"virtualenv"		=> "python-virtualenv",
 		"dot"			=> "graphviz",
 		"convert"		=> "imagemagick",
-		"xelatex"		=> "texlive-bin",
+		"xelatex"		=> "texlive-xetex",
 		"latexmk"		=> "texlive-core",
 		"rsvg-convert"		=> "extra/librsvg",
 	);