docs(rspeedy/core): use source.entry in example

[colinaaa]

Summary

The same as #729, but for source.entry instead of Entry.

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

[changeset-bot]

🦋 Changeset detected

Latest commit: d15a4d6

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 0 packages

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[codecov]

Bundle Report

Changes will increase total bundle size by 3.35kB (0.52%) ⬆️. This is within the configured threshold ✅

Detailed changes

Bundle name	Size	Change
@lynx-js/example-react-lynx-cjs	321.14kB	3.35kB (1.05%) ⬆️

Affected Assets, Files, and Routes:

view changes for bundle: @lynx-js/example-react-lynx-cjs

Assets Changed:

Asset Name	Size Change	Total Size	Change (%)
main.lynx.bundle	1.74kB	89.87kB	1.97%
.rspeedy/main/main-thread.js	744 bytes	40.8kB	1.86%
.rspeedy/main/background.*.js	864 bytes	39.91kB	2.21%

[codspeed-hq]

CodSpeed Performance Report

Merging #755 will not alter performance

_{Comparing colinaaa:colin/0509/entry (d15a4d6) with main (a68d104)}

Summary

✅ 1 untouched benchmarks