Improve API documentation for Enumerable.Index #98148
                
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Following feedback from https://github.com/dotnet/runtime/pull/95947/files/77cfd1694e08f0e00bc6d6fd84c7f6944fe563e9#diff-12d771219a25123dfc8964ed48a5e2fad41aa1c6a0e85fe1122fb8197dd57691