fix: document open option

[ematipico]

Changes

Closes #7398

For some reason server.open wasn't correctly typed. This fixes it.

Testing

Manual check

Docs

/cc @withastro/maintainers-docs for feedback!

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Latest commit: 86fbaa8

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[bluwy]

Should we also copy the docs to here?

astro/packages/astro/src/@types/astro.ts

Lines 881 to 891 in 8f4a04d

	/**
	* @docs
	* @name server.headers
	* @typeraw {OutgoingHttpHeaders}
	* @default `{}`
	* @version 1.7.0
	* @description
	* Set custom HTTP response headers to be sent in `astro dev` and `astro preview`.
	*/
	server?: ServerConfig | ((options: { command: 'dev' | 'preview' }) => ServerConfig);

A bit strange to do so, but maybe good so docs pick up the jsdoc.

[ematipico]

Should we also copy the docs to here?

astro/packages/astro/src/@types/astro.ts

Lines 881 to 891 in 8f4a04d

	/**
	* @docs
	* @name server.headers
	* @typeraw {OutgoingHttpHeaders}
	* @default `{}`
	* @version 1.7.0
	* @description
	* Set custom HTTP response headers to be sent in `astro dev` and `astro preview`.
	*/
	server?: ServerConfig | ((options: { command: 'dev' | 'preview' }) => ServerConfig);

A bit strange to do so, but maybe good so docs pick up the jsdoc.

Oh, I didn't see that section. Yes, it makes sense to copy them over