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chore(docs): add waitForValueToChange shim to migration guide (#924)

* Update MIGRATION_GUIDE.md

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@@ -115,6 +115,20 @@ APIs. A similar result can be achieved by using `waitFor`:
`115`	`115`	`+});`
`116`	`116`	```
`117`	`117`
	`118`	`+Alternatively this utility can be implemented as the following, for a direct migration:`
	`119`	`+`
	`120`	+```ts
	`121`	`+import { waitFor } from '@testing-library/react';`
	`122`	`+`
	`123`	`+const waitForValueToChange = async <T>(getValue: () => T) => {`
	`124`	`+ const original = getValue();`
	`125`	`+`
	`126`	`+ await waitFor(async () => {`
	`127`	`+ expect(await original).not.toBe(await getValue());`
	`128`	`+ });`
	`129`	`+};`
	`130`	+```
	`131`	`+`
`118`	`132`	## `waitForNextUpdate`
`119`	`133`
`120`	`134`	`This utility has not been included in the React Testing Library or React Native Testing Library`

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