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docs(readme): document function TextMatch closure limitation

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`@@ -330,7 +330,21 @@ Unique methods, not part of @testing-library/dom`
`330`	`330`	- Async utilities `waitForElement`, `waitForElementToBeRemoved` and `waitForDomChange` are not exposed. Consider using a `find*` query or a Playwright built-in like [`Locator.waitFor()`](https://playwright.dev/docs/api/class-locator#locator-wait-for).
`331`	`331`	- The `fireEvent` method is not exposed, use Playwright's built-ins instead.
`332`	`332`	`- Assertion extensions from [jest-dom](https://testing-library.com/docs/ecosystem-jest-dom/) are not compatible, use Playwright Test if possible.`
`333`		-- The [`getNodeText()`](https://testing-library.com/docs/dom-testing-library/api-custom-queries/#getnodetext) function is not currently supported for `Locator`.
	`333`	`+`
	`334`	`+### Locator Queries`
	`335`	`+`
	`336`	+- The [`getNodeText()`](https://testing-library.com/docs/dom-testing-library/api-custom-queries/#getnodetext) function is currently unsupported.
	`337`	+- When using a function for [`TextMatch`](https://testing-library.com/docs/queries/about/#textmatch), the function cannot reference its closure scope
	`338`	`+`
	`339`	+ ```ts
	`340`	`+ // ✅ This is supported`
	`341`	`+ screen.getByText(content => content.startsWith('Foo'))`
	`342`	`+`
	`343`	`+ // ❌ This is not supported`
	`344`	`+ const startsWithFoo = (content: string) => content.startsWith('Foo')`
	`345`	`+`
	`346`	`+ screen.getByText(content => startsWithFoo(content))`
	`347`	+ ```
`334`	`348`
`335`	`349`	`## Special Thanks`
`336`	`350`

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