chore: Fix segment key in FileData example (includes → included)

[devin-ai-integration]

Summary

What: The JSON segment example in the file data source XML doc comment (FileData.cs) used "includes" for segment members. Changed it to "included".

Why: The canonical segment field is "included" (with "excluded"). The parser reads included, so an includes key is silently dropped and copy-pasting the example doesn't actually add members to the segment.

Change:

 "segments": {
   "segment-key-1": {
     "key": "segment-key-1",
-    "includes": [ "user-key-1" ]
+    "included": [ "user-key-1" ]
   }
 }

Docs-only comment fix. No code, CHANGELOG, or version changes. Mirrors ruby-server-sdk#406 and sdk-meta#541.

Link to Devin session: https://app.devin.ai/sessions/741446729be24f46bb034334384575c7
Requested by: @jsonbailey

---

Note

Low Risk
Comment-only documentation change with no runtime or API behavior impact.

Overview
Corrects the file data source XML doc example in FileData.cs so segment membership uses "included" instead of "includes".

That matches the real segment JSON shape (alongside "excluded"). Copy-pasting the old example would not populate segment members because the parser only reads included.

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[devin-ai-integration]

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