docs: Fix broken link in architecture.md

[txels]

Description

The deeplink to the cosmos SDK was obsolete

---

Author Checklist

All items are required. Please add a note to the item if the item is not applicable and
please add links to any relevant follow up issues.

I have...

• included the correct docs: prefix in the PR title
• targeted the correct branch (see PR Targeting)
• provided a link to the relevant issue or specification
• followed the documentation writing guidelines
• reviewed "Files changed" and left comments if necessary
• confirmed all CI checks have passed

Reviewers Checklist

All items are required. Please add a note if the item is not applicable and please add
your handle next to the items reviewed if you only reviewed selected items.

I have...

• confirmed the correct docs: prefix in the PR title
• confirmed all author checklist items have been addressed
• confirmed that this PR only changes documentation
• reviewed content for consistency
• reviewed content for thoroughness
• reviewed content for spelling and grammar
• tested instructions (if applicable)

[JeancarloBarrios]

Thanks for the PR, there are just some failing tests, @blushi Maybe you have more insight about this ones ?