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Fix link to stable docs in README (#606) #657

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Job	Run time
Documentation	3m 5s
Julia 1 - ubuntu-latest x64	7m 52s
Julia 1 - windows-latest x64	8m 49s
Julia 1 - macOS-13 x64	10m 24s
Julia 1 - macOS-latest aarch64	5m 3s
Julia 1 - ubuntu-latest x86	10m 2s
Julia min - ubuntu-latest x64	4m 47s
Julia pre - ubuntu-latest x64	7m 38s
	57m 40s