fix: wrap long comment line to satisfy noir formatter

[AztecBot]

Summary

Fixes the noir formatter CI failure on PR #21995 by wrapping a doc comment line in initialization_utils.nr that was exactly 120 characters — the formatter wants to break it at a word boundary.

The line /// Only checks the private initialization nullifier in the settled nullifier tree. Since both nullifiers are emitted in was exactly 120 chars. The formatter wraps after "emitted" instead of keeping "emitted in" together.

Test plan

• CI noir-projects build step should pass with this fix

ClaudeBox log: https://claudebox.work/s/0150633f06bfb379?run=2

[AztecBot]

Automatically closing this stale claudebox draft PR (no updates for 5+ days). Re-open if still needed.