[docs] add note on airbyte vs singer

[swyxio]

to clarify question raised during conference, and answered by @johnlafleur

@gosusnp i'm wondering if we need to note anything for [Protocol v1] (#19846)?

[evantahler]

👍 for docs!

[evantahler]

@sw-yx What about

airbyte/docs/understanding-airbyte/airbyte-protocol.md

Lines 902 to 904 in ca67ee7

	## Acknowledgements
	We'd like to note that we were initially inspired by Singer.io's [specification](https://github.com/singer-io/getting-started/blob/master/docs/SPEC.md#singer-specification) and would like to acknowledge that some of their design choices helped us bootstrap our project. We've since made a lot of modernizations to our protocol and specification, but don't want to forget the tools that helped us get started.

[gosusnp]

@sw-yx, what kind of notes did you have in mind?

I was looking at the change that added some changes that are going to be tagged as part of v1 (#17486)
Updates have been done in place, I think we should go over those changes and keep some version specific documentation.

[swyxio]

@evantahler it doesnt link to the comparison doc, and its position at the end makes it hard to find leading poeple to still ask us despite including that mention

@gosusnp no other notes!

[natikgadzhi]

Haven't heard the ask in a while, and Singer seems to be, ahem, more and more out of date.