dm: fix filter to filters to match the field name used elsewhere

[yahonda]

What is changed, added or deleted? (Required)

"add a `filter` to the task configuration file of DM" uses the singular `filter`, but the field name is `filters` (plural) — as shown in the very next code block in this same file, and documented via the `#### `filters` {#filters}` heading in `dm/task-configuration-file-full.md`.

Source-code verification: `dm/config/task.go` defines the field as `Filters map[string]*bf.BinlogEventRule `yaml:"filters" toml:"filters" json:"filters"`` — confirming `filters` (plural) is the actual field name recognized by DM, in both the YAML task config and its TOML/JSON representations.

Which TiDB version(s) do your changes apply to? (Required)

• master (the latest development version)
• v8.5 (TiDB 8.5 versions)
• v8.4 (TiDB 8.4 versions)
• v8.3 (TiDB 8.3 versions)
• v8.2 (TiDB 8.2 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)

What is the related PR or file link(s)?

• This PR is translated from:
• Other reference link(s):

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

Summary by CodeRabbit

• Documentation
  • Updated the binlog event filtering instructions to reference the correct filters configuration key, matching the accompanying YAML example.

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• filter-binlog-event.md

📝 Walkthrough

Walkthrough

The binlog event filtering documentation now refers to the filters configuration key, matching the YAML example.

Changes

Binlog filter documentation

Layer / File(s)	Summary
Update filter configuration instruction filter-binlog-event.md	Changed the instruction from filter to filters.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~2 minutes

Change: Other

Merge Risk: 🔵 Low · up to eb3a9

Users can identify the intended field, but the instruction is ungrammatical. Correcting the wording is a small documentation fix before merge.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the main documentation fix: changing filter to filters to match the documented field name.
Description check	✅ Passed	The description explains the change, provides source-code verification, identifies the affected version, and records AI involvement. The related-link fields are empty, but they are not critical for th…
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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