Update WordPress.org copy to reflect changes and correct errors

[csmcneill]

Description

The readme.txt file populates on WordPress.org here. However, some of this information could use a refresh:

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woocommerce-payments/readme.txt

Line 31 in 952e431

WooPayments is **free to install**, with **no setup fees or monthly fees**. Pay-as-you-go fees start at 2.9% + $0.30 per transaction for U.S.-issued cards. [Read more about transaction fees](https://woocommerce.com/document/woopayments/fees-and-debits/fees/).

This is only true if you're a US merchant accepting domestic cards.

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woocommerce-payments/readme.txt

Line 35 in 952e431

Our global support team is available to answer questions you may have about WooPayments installation, setup, or use. For assistance, [open a ticket on woocommerce.com](https://woocommerce.com/my-account/create-a-ticket/?select=5278104).

The URL is now https://woocommerce.com/my-account/contact-support/?select=5278104.

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woocommerce-payments/readme.txt

Line 43 in 952e431

* PHP 7.3 or newer is recommended.

This is recommended, but 7.3 is noted as required here.

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woocommerce-payments/readme.txt

Lines 57 to 61 in 952e431

	= What countries and currencies are supported? =
	If you are an individual or business based in [one of these countries](https://woocommerce.com/document/woopayments/compatibility/countries/#supported-countries), you can sign-up with WooPayments. After completing sign up, you can accept payments from customers anywhere in the world.
	We are actively planning to expand into additional countries based on your interest. Let us know where you would like to [see WooPayments launch next](https://woocommerce.com/payments/#request-invite).

This section indicates which countries are supported but not which currencies. Currencies are covered in this document.

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woocommerce-payments/readme.txt

Lines 63 to 65 in 952e431

	= Why is a WordPress.com account and connection required? =
	WooPayments uses the WordPress.com connection to authenticate each request, connecting your store with our payments partner.

We can expand on this and link out to this document.

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woocommerce-payments/readme.txt

Line 49 in 952e431

WooPayments has experimental support for the Checkout block from [WooCommerce Blocks](https://wordpress.org/plugins/woo-gutenberg-products-block/). Please check the [FAQ section](#faq) for more information.

woocommerce-payments/readme.txt

Lines 79 to 86 in 952e431

	= How does the Checkout block work? =
	You need the [WooCommerce Blocks](https://wordpress.org/plugins/woo-gutenberg-products-block/) plugin to be installed and active to use the Checkout block. Once you add the block to a page, WooPayments will automatically appear as an option.
	Please note that our support for the checkout block is still experimental and the following features of the gateway will probably not work:
	* Using saved cards and saving cards.
	* Integration with WooCommerce Subscriptions.

Unless I'm mistaken, these items are full of incorrect information. I'm pretty sure that:

1. WooPayments is fully compatible with the Cart and Checkout Blocks.
2. The Checkout Block is no longer a separate extension.

This section should either be heavily modified or deleted entirely.

Acceptance criteria

The above items are addressed in the readme.txt file.

[vbelolapotkov]

@csmcneill thanks for flagging those! I agree it would be nice to fix those, do you have edits suggestions? Asking because in order to fix those we'd come to your team eventually for preferred wording 🙂 So my suggestion to you would be to open a PR with changes, or share edited readme version (here or somewhere internally) so we could assist with merging the changes.

[aheckler]

I can take a look when I'm back from AFK.