gh-121645: Fix typo in PyBytes_Join() doc (#123783) #43

Job	Run time
Interpreter (Debug)	6m 55s
Free-Threaded (Debug)	10m 4s
i686-pc-windows-msvc/msvc (Debug)	17m 12s
i686-pc-windows-msvc/msvc (Release)	21m 42s
x86_64-pc-windows-msvc/msvc (Debug)	17m 37s
x86_64-pc-windows-msvc/msvc (Release)	21m 51s
aarch64-pc-windows-msvc/msvc (Debug)	3m 27s
aarch64-pc-windows-msvc/msvc (Release)	5m 4s
x86_64-apple-darwin/clang (Debug)	11m 11s
x86_64-apple-darwin/clang (Release)	22m 21s
aarch64-apple-darwin/clang (Debug)	10m 23s
aarch64-apple-darwin/clang (Release)	14m 10s
x86_64-unknown-linux-gnu/gcc (Debug)	7m 29s
x86_64-unknown-linux-gnu/gcc (Release)	17m 54s
x86_64-unknown-linux-gnu/clang (Debug)	7m 57s
x86_64-unknown-linux-gnu/clang (Release)	13m 55s
aarch64-unknown-linux-gnu/gcc (Debug)	1h 11m 52s
aarch64-unknown-linux-gnu/gcc (Release)	22m 50s
aarch64-unknown-linux-gnu/clang (Debug)	1h 5m 32s
aarch64-unknown-linux-gnu/clang (Release)	36m 47s
	6h 46m 13s

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