[DOCS] Updating to reflect current Expectation dev state

[spencerhardwick]

These changes reflect the current state of Expectation implementations in v3

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Changes proposed in this pull request:

• Updated the Expectation Implementations by Backend table on the v3 docs to reflect work completed by Superconductive Product Engineering last development cycle.

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[github-actions]

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[cdkini]

Going off of the assumption that this view is indeed correct, I'm happy to sign off :)

Thanks for all the hard work with this and for making our docs that much nicer 🎉

[bhcastleton]

Do we want to say something like “Updated as of September 2, 2021” ?? If not, then I assume we'll keep it up-to-date until the gallery comes out.

[spencerhardwick]

Going off of the assumption that this view is indeed correct, I'm happy to sign off :)

Thanks for all the hard work with this and for making our docs that much nicer 🎉

Thanks Chetan!

[kyleaton]

@cla-bot check