Incorrect description and confusing operation of the createSubAccount function

[AlexKushnir1]

Description

The documented parameters for function createSubAccount are not appropriate namely contract

near-api-js/packages/client/src/transactions/create_account.ts

Lines 35 to 51 in c49fd67

	* Create a new sub-account under an existing account
	* (e.g. create `sub.new.near` by signing with `new.near`)
	* @param account name of the existing account under which the new account is created
	* @param contract root contract for the target network (e.g. `testnet`)
	* @param newAccount name of the created account
	* @param newPublicKey public key for the created account's initial full access key
	* @param initialBalance initial account balance in yN
	* @param blockReference block ID/finality
	* @param deps sign-and-send dependencies
	*/
	export async function createSubAccount({ account, newAccount, newPublicKey, initialBalance, blockReference, deps }: CreateAccountParams) {
	return SignedTransactionComposer.init({ sender: account, receiver: newAccount, deps })
	.createAccount()
	.transfer(initialBalance)
	.addFullAccessKey(newPublicKey)
	.signAndSend(blockReference);
	}

Also it"s weird for me that we must to pass the name of existing account and then new name with parent"s suffix. Like:

{
  account: 'true-pull.testnet',
  newAccount: 'alex.true-pull.testnet',
...

It"s need to be described, I"m not sure that we can change due to the design

Optional: User Story

As a user, I realy like the near-api-rs way to creating accounts and its checking is_sub_account_of()

I would like to work on it. Grateful for every feedback!