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A typo fix updateneeded in IndexedDB

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Original file line number	Diff line number	Diff line change
`@@ -277,7 +277,7 @@ db.transaction(store[, type]);`
`277`	`277`	- `readonly` -- can only read, the default.
`278`	`278`	- `readwrite` -- can only read and write the data, but not create/remove/alter object stores.
`279`	`279`
`280`		-There's also `versionchange` transaction type: such transactions can do everything, but we can't create them manually. IndexedDB automatically creates a `versionchange` transaction when opening the database, for `updateneeded` handler. That's why it's a single place where we can update the database structure, create/remove object stores.
	`280`	+There's also `versionchange` transaction type: such transactions can do everything, but we can't create them manually. IndexedDB automatically creates a `versionchange` transaction when opening the database, for `upgradeneeded` handler. That's why it's a single place where we can update the database structure, create/remove object stores.
`281`	`281`
`282`	`282`	```smart header="Why are there different types of transactions?"
`283`	`283`	Performance is the reason why transactions need to be labeled either `readonly` and `readwrite`.

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