fix Documentation of calculation of y_base #3666

Job	Run time
Build sdist and set version	36s
Build and test in Conda (ubuntu)	42s
build-cpp-test-linux (debug, gcc)	1s
Build and test in Conda (windows)	3s
build-cpp-test-linux (debug, clang)	1s
build-cpp-test-linux (release, gcc)	1s
build-cpp-test-macos (debug)	1s
build-cpp-test-linux (release, clang)	1s
build-cpp-test-macos (release)	1s
build-cpp-test-windows (debug, msvc)	1s
build-cpp-test-windows (debug, clang-cl)	1s
build-cpp-test-windows (release, msvc)	1s
build-cpp-test-windows (release, clang-cl)	1s
build-and-test-python (linux-x64)	1s
build-and-test-python (linux-aarch64)	1s
build-and-test-python (macos)	1s
build-and-test-python (windows)	1s
test-python-macos-arm64	1s
publish-wheels	3s
	1m 39s

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