Remove square bracket from end of hyperlink in docs/architecture.md

[SarahFrench]

Fixes a link in the docs/architecture.md file that otherwise would link to http://localhost:8080/github.com/hashicorp/terraform/internal/configs/configload%5D

"Saving the world, one character at a time"

Target Release

N/A

Draft CHANGELOG entry

N/A

[SarahFrench]

There's a failed equivalence test on this PR that seems to be due to assertions about how long a given action would take during a test:

[SarahFrench]

Thanks!

[github-actions]

Reminder for the merging maintainer: if this is a user-visible change, please update the changelog on the appropriate release branch.

[github-actions]

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