Content: Introduce emulation section, move reshape examples there

[inexorabletash]

Per discussion in #551, move the squeeze, unsqueeze, and flatten examples from the reshape definition into a dedicated section.

Fixes #551

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Preview | Diff

[inexorabletash]

Notes:

• The Appendices - MLOperandDataType and ArrayBufferView compatibility section is normative but now follows two non-normative sections. Can we rename and move it up?
• This PR only tackles part of the discussion in Deprecated squeeze with emulation path is missing its own section #551 namely moving squeeze (etc) out of reshape. It doesn't move any example decompositions out. If we want to do that, here's an idea
  • Give the new "Operator Emulation" section two subsections: "Emulation" (what's there now) and "Decomposition"
  • Move the 23 "generically emulated" blocks into "decomposition". Reword the preambles to be "The behavior of the hardSwish operation..."
  • Leave non-normative links in a standard format, e.g. "The behavior of this operation can be generically emulated." (which links to the emulation)
  • I am worried about bloating the Table of Contents with the decompositions, though, so I'd propose we leave those out.

I don't feel strongly about any of this, it just seemed an easy issue to resolve...

[zolkis]

Makes sense to me.

[inexorabletash]

@huningxin - can you take a look? Maybe we should merge as-is or with minor tweaks, rather than trying to "boil the ocean" with other spec structure changes? I'm happy to incorporate any suggested changes, though.

[huningxin]

LGTM!

[huningxin]

@huningxin - can you take a look? Maybe we should merge as-is or with minor tweaks, rather than trying to "boil the ocean" with other spec structure changes?

+1 to merge as-is.

@fdwr , do you have any further comments?

[anssiko]

Happy to see this editorial detail get addressed. Now seeing this in the spec preview helps a bunch and I agree this is a good compromise i.e. keep decompositions close to ops and for those ops that are not (anymore) part of the WebNN op set put them into this Operator Emulation section.

[fdwr]

👍 Thanks JB.

fdwr , do you have any further comments?

Sorry, fell down into my notification soup.