Update docs for eager rent collection

[ryoqun]

Problem

Docs for rent is a bit outdated regarding its timings with the debut of eager rent collection #9527 on mainnet-beta in 1.5 day (epoch 34~).

Ideally, I think the docs update should go first, but the eager rent collection is pursued due to rather urgent security concern and performance degradation due to unbounded live account data growth (#8931).

Summary of Changes

Update the doc for eager rent collection with some bonus clarifications.

Also, note that I intentionally didn't introduce eager-/lazy- rent collection terminology because these are implementation details and named from the historical background. From user's perspective, the eager rent collection looks lazy now, exactly opposite to the naming!

CCs

Any comments are appreciated!

@sakridge: as a reviewer of the actual implementation pr, does this represents the behind intention of the PR well?
@ericlwilliams, @aeyakovenko: regarding recent discussion on economic design for rent, I believe this is exactly what this is implemented in code. Is there any unclear parts the docs still is missing?
@CriesofCarrots: partly related to #10133, originating from #10054, I've added some clarification along with the new mention of eager rent collection. Is there any other omission?

Fixes #10133

[ryoqun]

Another FYI!:

@jstarry: Do you have something else to add here, regarding #7413 and various comments you made recently for eager rent collection?

[CriesofCarrots]

@ryoqun , it will be great to get the design docs updated.

I also created a stub page here for a developer-focused doc on rent and accounts: https://docs.solana.com/apps/rent
I was hoping we could offer a straightforward, functional introduction to rent here. If you want to take an initial crack at it, that would be great. But if not, let's keep #10133 open.
CC @danpaul000, I think that would fall under your current focus?

[ryoqun]

I was hoping we could offer a straightforward, functional introduction to rent here. If you want to take an initial crack at it, that would be great.

Okay, I'll take the initial crack. :)

[ericlwilliams]

Just a couple of comments / questions on the write-up. Thanks!

[ryoqun]

@ericlwilliams Thanks for reviewing! I've addressed your comments and clarified the text a bit. :)

[ryoqun]

@CriesofCarrots I think I've addressed all your comments. :)

[garious]

No need to block on my review. I haven't had a chance to review in depth, but looks quite detailed! Thanks for writing this up.

[ryoqun]

No need to block on my review. I haven't had a chance to review in depth, but looks quite detailed! Thanks for writing this up.

@garious I see!

From @CriesofCarrots:

I also created a stub page here for a developer-focused doc on rent and accounts: https://docs.solana.com/apps/rent
I was hoping we could offer a straightforward, functional introduction to rent here. If you want to take an initial crack at it, that would be great. But if not, let's keep #10133 open.
CC @danpaul000, I think that would fall under your current focus?

@danpaul000 Hi! Do you mind having a look at this pr? If there is no objections, I want to merge this because I think it's getting mature to merge. :)

[danpaul000]

No need to block on my review. I haven't had a chance to review in depth, but looks quite detailed! Thanks for writing this up.

@garious I see!

From @CriesofCarrots:

I also created a stub page here for a developer-focused doc on rent and accounts: https://docs.solana.com/apps/rent
I was hoping we could offer a straightforward, functional introduction to rent here. If you want to take an initial crack at it, that would be great. But if not, let's keep #10133 open.
CC @danpaul000, I think that would fall under your current focus?

@danpaul000 Hi! Do you mind having a look at this pr? If there is no objections, I want to merge this because I think it's getting mature to merge. :)

Looks good to me @ryoqun , thanks for the write-up!