docs: add the iOS viewport measurement fix to the v11 guide

[plum117]

Why

#1307 (measure the iOS viewport again when a Safari tip takes the native tap) is a fix that users can notice, but it did not add a line to docs/v11-migration.md, as AGENTS.md asks.

What

• docs/v11-migration.md, "Smaller fixes": one entry for the iOS fix (the Safari tip on the first start of a new simulator or device, the old "Negative scroll position detected" error, and what the service does now).

Docs only, no changeset.

🤖 Generated with Claude Code

[changeset-bot]

⚠️ No Changeset found

Latest commit: 8fcf95d

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[greptile-apps]

Confidence Score: 5/5

[Low impact] This documentation-only change appears safe to merge.

Summary

Adds the iOS viewport fix to the v11 migration guide.

• The v11 guide now explains the iOS Safari first-start viewport retry.

_{Reviews (1) · Last reviewed commit: "docs: add the iOS viewport measurement f..." · Reviewed by Greptile}