[DOC] Fix default latex_elements['papersize'] #1

Job	Run time
Interpreter (Debug)	1h 16m 57s
Free-Threaded (Debug)	10m 16s
i686-pc-windows-msvc/msvc (Debug)	3m 27s
i686-pc-windows-msvc/msvc (Release)	3m 58s
x86_64-pc-windows-msvc/msvc (Debug)	2m 19s
x86_64-pc-windows-msvc/msvc (Release)	2m 20s
aarch64-pc-windows-msvc/msvc (Debug)	3m 37s
aarch64-pc-windows-msvc/msvc (Release)	3m 22s
x86_64-apple-darwin/clang (Debug)	11m 50s
x86_64-apple-darwin/clang (Release)	23m 29s
aarch64-apple-darwin/clang (Debug)	9m 54s
aarch64-apple-darwin/clang (Release)	12m 55s
x86_64-unknown-linux-gnu/gcc (Debug)	8m 20s
x86_64-unknown-linux-gnu/gcc (Release)	17m 30s
x86_64-unknown-linux-gnu/clang (Debug)	8m 9s
x86_64-unknown-linux-gnu/clang (Release)	14m 12s
aarch64-unknown-linux-gnu/gcc (Debug)	1h 13m 21s
aarch64-unknown-linux-gnu/gcc (Release)	54m 34s
aarch64-unknown-linux-gnu/clang (Debug)	1h 10m 15s
aarch64-unknown-linux-gnu/clang (Release)	37m 9s
	7h 27m 54s

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