Update doc for IterateAccounts x/auth keeper meethod

[prb-pro]

Description

Update doc for IterateAccounts x/auth keeper method.
Iterator stops when callback returns true instead of false (as stated in documentation)

---

Before we can merge this PR, please make sure that all the following items have been
checked off. If any of the checklist items are not applicable, please leave them but
write a little note why.

• Targeted PR against correct branch (see CONTRIBUTING.md)
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
  N/A - did not find any open issue for this, seems as small change for opening issue
• Code follows the module structure standards.
• Wrote unit and integration tests
  N/A
• Updated relevant documentation (docs/) or specification (x/<module>/spec/)
• Added relevant godoc comments.
• Added a relevant changelog entry to the Unreleased section in CHANGELOG.md
  N/A
• Re-reviewed Files changed in the Github PR explorer
• Review Codecov Report in the comment section below once CI passes

[amaury1093]

yeah

[amaury1093]

@l-parabellum could you merge/rebase master so that our automerge bot can merge your PR?

[prb-pro]

@l-parabellum could you merge/rebase master so that our automerge bot can merge your PR?

Rebased to master now.

[amaury1093]

@l-parabellum could you actually allow write access to your fork? Or else you'll need to constantly rebase.

[codecov]

Codecov Report

Merging #9285 (a996367) into master (8cfa2c2) will decrease coverage by 0.02%.
The diff coverage is n/a.

❗ Current head a996367 differs from pull request most recent head 9b867db. Consider uploading reports for the commit 9b867db to get more accurate results

@@            Coverage Diff             @@
##           master    #9285      +/-   ##
==========================================
- Coverage   60.33%   60.30%   -0.03%     
==========================================
  Files         585      591       +6     
  Lines       36789    36937     +148     
==========================================
+ Hits        22195    22276      +81     
- Misses      12624    12691      +67     
  Partials     1970     1970              

Impacted Files	Coverage Δ
x/auth/keeper/keeper.go	49.29% <ø> (ø)
x/authz/authorization_grant.go	0.00% <0.00%> (-36.00%)	⬇️
x/authz/simulation/genesis.go	81.81% <0.00%> (-9.10%)	⬇️
crypto/keys/internal/ecdsa/privkey.go	73.91% <0.00%> (-8.70%)	⬇️
crypto/keys/secp256r1/pubkey.go	76.92% <0.00%> (-3.08%)	⬇️
x/authz/msgs.go	53.93% <0.00%> (-3.03%)	⬇️
crypto/keys/secp256r1/privkey.go	80.00% <0.00%> (-2.36%)	⬇️
client/keys/add.go	62.50% <0.00%> (ø)
version/command.go	83.33% <0.00%> (ø)
telemetry/metrics.go	56.86% <0.00%> (ø)
... and 17 more

[prb-pro]

@l-parabellum could you actually allow write access to your fork? Or else you'll need to constantly rebase.

Sorry @AmauryM, you should have write access now.