Fix response type of putExtensibleStringValue in special-words spec

[Copilot]

Follow-up to #9785: the putExtensibleStringValue operation was missing an explicit response content-type header, inconsistent with the pattern used by other extensible enum endpoints.

• Updated return type in packages/http-specs/specs/special-words/main.tsp:

putExtensibleStringValue(@body body: ExtensibleString): {
    @header contentType: "application/json";
    @body body: ExtensibleString;
};

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[azure-sdk]

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[pkg-pr-new]

Open in StackBlitz

npm i https://pkg.pr.new/@typespec/http-specs@9953

commit: 71079ae

[github-actions]

All changed packages have been documented.

• ✅ @typespec/http-specs

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@typespec/http-specs - fix ✏️

Fix response type of putExtensibleStringValue to include explicit content-type header

[msyyc]

@timotheeguerin Pls help review the fix PR, thanks!