Documentation of System.Runtime.Intrinsics missing

[Aniobodo]

The current descriptions regarding Vector APIs of System.Runtime.Intrinsics cannot be decribed as documentation.
Please add proper documentation with examples, expected results and explanation to all uncommon jargons.

[krwq]

cc: @tannergooding

[dotnet-policy-service]

Tagging subscribers to this area: @dotnet/area-system-runtime-intrinsics

[tannergooding]

Duplicate of dotnet/runtime#81753

This is a legal problem. The documentation for the instructions, including the relevant psuedo-code describing how they operate, is copyrighted by the respective companies (Intel for Intel's docs, AMD for AMD's docs, etc). Due to the scale, explicit permissions are required to reproduce such documentation in our own.

There is then the additional consideration that our docs are normally creative commons, but this subset would likely not be, which adds its own complications to the process.

The current documentation does what we can and gives enough information for developers to refer to the architecture specific instruction manuals or documentation for more information on behavior.