docs: fix references to root CONTRIBUTING.md file #3082

Job	Run time
Source	15s
Documentation	11m 22s
Java 11	1m 9s
Linux almalinux-8	7m 50s
Go ubuntu-latest	1m 42s
Linux almalinux-9	8m 7s
Go windows-latest	4m 45s
Linux debian-bookworm	7m 8s
Python ${{ matrix.arch }} Conda	0s
Python ${{ matrix.arch }} Conda	0s
Go macos-13	3m 52s
Linux ubuntu-jammy	7m 33s
Linux ubuntu-noble	7m 51s
Python amd64 macOS	23m 35s
Python amd64 manylinux	11m 49s
Python sdist	7m 12s
Python arm64v8 macOS	10m 7s
Python arm64v8 manylinux	10m 51s
Python 3.9 Windows	15m 40s
Python 3.10 Windows	14m 21s
Python 3.11 Windows	14m 35s
Python 3.12 Windows	15m 49s
Python 3.13 Windows	15m 31s
Upload packages to Anaconda.org	0s
C#/.NET	58s
Create release	0s
Upload packages to Gemfury	0s
	3h 22m 2s

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