fix Documentation of calculation of y_base #3667

Job	Run time
build-cpp-test-macos (debug)	12m 22s
build-cpp-test-linux (debug, gcc)	18m 0s
build-cpp-test-macos (release)	18m 0s
Build sdist and set version	37s
build-cpp-test-linux (debug, clang)	12m 7s
Build and test in Conda (ubuntu)	2m 51s
build-cpp-test-linux (release, gcc)	35m 17s
Build and test in Conda (windows)	5m 48s
build-cpp-test-linux (release, clang)	17m 57s
build-cpp-test-windows (debug, msvc)	11m 47s
build-cpp-test-windows (debug, clang-cl)	17m 2s
build-cpp-test-windows (release, msvc)	18m 5s
build-cpp-test-windows (release, clang-cl)	20m 7s
build-and-test-python (linux-x64)	10m 15s
build-and-test-python (linux-aarch64)	35m 35s
build-and-test-python (macos)	9m 6s
build-and-test-python (windows)	12m 10s
test-python-macos-arm64	0s
publish-wheels	6s
	4h 17m 12s

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