As we start to work on implementing Action IDs, the spec written a few
years ago needs some updates. This PR makes those updates for the
current implementation plan.
References #6899
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## Summary of the Pull Request
Fix typos found by codespell. Some of it in documentation and user-visible text, mostly in code comments. While I understand you might not be interested in fixing code comments, one of the reasons being extra noise in git history, kindly note that most spell checking tools do not discriminate between documentation and code comments. So it's easier to fix everything for long maintenance.
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## References
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## PR Checklist
* [ ] Closes #xxx
* [X] CLA signed. If not, go over [here](https://cla.opensource.microsoft.com/microsoft/Terminal) and sign the CLA
* [x] Tests added/passed
* [X] Documentation updated. If checked, please file a pull request on [our docs repo](https://github.com/MicrosoftDocs/terminal) and link it here: [#501](https://github.com/MicrosoftDocs/terminal/pull/501)
* [ ] Schema updated.
* [ ] I've discussed this with core contributors already. If not checked, I'm ready to accept this work might be rejected in favor of a different grand plan. Issue number where discussion took place: #xxx
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## Detailed Description of the Pull Request / Additional comments
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## Validation Steps Performed
I have checked and re-checked all changes.
## Summary of the Pull Request
⚠️ This spec has been moved from #6902. That version was branched off the new tab menu customization, and had a terribly convoluted git history. After discussion with the team, we've decided that it's best that this spec is merged atomically _first_, and used as the basis for #5888, as opposed to the other way around.
> This document is intended to serve as an addition to the [Command Palette Spec],
> as well as the [New Tab Menu Customization Spec].
>
> As we come to rely more on actions being a mechanism by which the user defines
> "do something in the Terminal", we'll want to make it even easier for users to
> re-use the actions that they've already defined, as to reduce duplicated json as
> much as possible. This spec proposes a mechanism by which actions could be
> uniquely identifiable, so that the user could refer to bindings in other
> contexts without needing to replicate an entire json blob.
>
## PR Checklist
* [x] Specs: #6899
* [x] References: #1571, #1912, #3337, #5025, #5524, #5633
* [x] I work here
## Detailed Description of the Pull Request / Additional comments
_\*<sup>\*</sup><sub>\*</sub> read the spec <sub>\*</sub><sup>\*</sup>\*_
[Command Palette Spec]: https://github.com/microsoft/terminal/blob/master/doc/specs/%232046%20-%20Command%20Palette.md
[New Tab Menu Customization Spec]: https://github.com/microsoft/terminal/blob/master/doc/specs/%231571%20-%20New%20Tab%20Menu%20Customization.md