Tensor documentation update. (#TF-448)

[ksasi]

Updated documentation for Tensor in Tensor.swift file

Resolves TF-448.

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[ksasi]

I signed it!

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[ksasi]

I signed it!

[ksasi]

I signed it!

[rxwei]

Thanks a lot! I left some comments on the wording as well as the formatting style which is different from the apple/swift repo.

[rxwei]

The column limit in this repo is 100. Could you please make these comments fit in 100 columns?

[ksasi]

sure, I have made sure that these comments fit in 100 columns.

[rxwei]

Although they do fit within 100 columns, I don't believe they fit to size yet. Could you expand each line so that it fits to size?

[ksasi]

As suggested, each line is expanded so that it fits to size.

[ksasi]

I signed it!

[ksasi]

I signed it!

[rxwei]

Thank you!

[ksasi]

@googlebot rescan