docs: correct build.client and build.server @default to include trailing slash

[dfedoryshchev]

The @default annotations for build.client and build.server drop the trailing slash that the real defaults carry: ASTRO_CONFIG_DEFAULTS sets client: './client/' and server: './server/', while the JSDoc documents './client' and './server'. This corrects the annotations to match the resolved values shown in the config reference.

[changeset-bot]

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Latest commit: 8c156df

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[codspeed-hq]

Merging this PR will not alter performance

✅ 18 untouched benchmarks

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_{Comparing dfedoryshchev:docs/build-default-trailing-slash (8c156df) with main (24d2c9e)¹}

Footnotes

1. No successful run was found on main (75f455c) during the generation of this report, so 24d2c9e was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩