Tensor doc improvements

[gewarren]

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[Copilot]

Pull Request Overview

This PR enhances XML documentation for Tensor interfaces by clarifying property summaries, adding <value> tags, and standardizing punctuation in example remarks.

• Improved summaries and added <value> tags for HasAnyDenseDimensions and IsDense properties.
• Standardized wording (“one element” instead of “1 element”) and punctuation in remarks.
• Added missing period in the ToDenseTensor example.

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/libraries/System.Numerics.Tensors/src/System/Numerics/Tensors/netcore/IReadOnlyTensor_1.cs	Added period to example remark in ToDenseTensor docs
src/libraries/System.Numerics.Tensors/src/System/Numerics/Tensors/netcore/IReadOnlyTensor.cs	Updated property summaries, added <value> tags, and reworded remarks

Comments suppressed due to low confidence (1)

src/libraries/System.Numerics.Tensors/src/System/Numerics/Tensors/netcore/IReadOnlyTensor_1.cs:89

• The example shows Strides: [4, 1] for a dense 2×2 Tensor, but correct contiguous strides should be [2, 1]. Please update the remark to reflect the accurate stride values.

///   <para>For a 2x2 Tensor, this would mean it has <c>FlattendLength: 4; Lengths: [2, 2]; Strides: [4, 1]</c>. The elements would be sequentially accessed via indexes: <c>[0, 0]; [0, 1]; [1, 0]; [1, 1]</c>.</para>