releases: fix "ix" in the v3.0.10 release notes

[yahonda]

What is changed, added, or deleted? (Required)

In the v3.0.10 release notes, a TiDB item starts with "ix a MySQL incompatibility issue by adding Truncated error detection to decimal division calculation" (tidb/pull/14673). The "F" of "Fix" is missing. This PR restores it.

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Tips for choosing the affected version(s):

By default, CHOOSE MASTER ONLY so your changes will be applied to the next TiDB major or minor releases. If your PR involves a product feature behavior change or a compatibility change, CHOOSE THE AFFECTED RELEASE BRANCH(ES) AND MASTER.

For details, see tips for choosing the affected versions.

• master (the latest development version)
• v9.0 (TiDB 9.0 versions)
• v8.5 (TiDB 8.5 versions)
• v8.1 (TiDB 8.1 versions)
• v7.5 (TiDB 7.5 versions)
• v7.1 (TiDB 7.1 versions)
• v6.5 (TiDB 6.5 versions)

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AI agent involvement

• The changes in this PR were primarily made by an AI agent on behalf of the PR author.

Do your changes match any of the following descriptions?

• Delete files
• Change aliases
• Need modification after applied to another branch
• Might cause conflicts after applied to another branch

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• releases/release-3.0.10.md

• Autopilot · Keep fixing CodeRabbit findings and required CI, and resolving merge conflicts

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