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chore: add sample snippet to configure main fields for module resolution algorithm (#15687)

Co-authored-by: Christoph Nakazawa <xnakazawa@pm.me>

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Original file line number	Diff line number	Diff line change
`@@ -1529,6 +1529,19 @@ const config: Config = {`
`1529`	`1529`	`exportdefaultconfig;`
`1530`	`1530`	```
`1531`	`1531`
	`1532`	+Jest's`jest-resolve` relies on`unrs-resolver`. We can pass additional options, for example modifying`mainFields` for resolution. For example, for React Native projects, you might want to use this config:
	`1533`	`+`
	`1534`	+```js
	`1535`	`+module.exports= (path,options)=> {`
	`1536`	`+// Call the defaultResolver, so we leverage its cache, error handling, etc.`
	`1537`	`+returnoptions.defaultResolver(path, {`
	`1538`	`+...options,`
	`1539`	+// See this `unrs-resolver` option: from https://github.com/unrs/unrs-resolver?tab=readme-ov-file#main-field
	`1540`	`+ mainFields: ['react-native','main'],`
	`1541`	`+ });`
	`1542`	`+};`
	`1543`	+```
	`1544`	`+`
`1532`	`1545`	###`restoreMocks`\[boolean]
`1533`	`1546`
`1534`	`1547`	Default:`false`

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