chore: simplify changeset file per reviewer feedback

Remove Notes section and keep changeset more concise as suggested in PR review.

Author: boice-sealint

.changeset/mcp-structured-content.md

@@ -7,8 +7,3 @@ feat(mcp): add structuredContent support behind `useStructuredContent`; return f
 - `MCPServer#callTool` now returns the full `CallToolResult` (was `content[]`), exposing optional `structuredContent`.
 - Add `useStructuredContent` option to MCP servers (stdio/streamable-http/SSE), default `false` to avoid duplicate data by default.
 - When enabled, function tool outputs include `structuredContent` (or return it alone when no `content`).
-
-Notes
-
-- Type-only breaking change for direct `callTool` consumers: use `result.content` where arrays were expected.
-- Behavior matches Python SDK feature (openai-agents-python#1150) while keeping JS outputs ergonomic (objects/arrays, no JSON stringify/parse overhead).