[Mobile Payments] Update card reader manual URLs

[joshheald]

Closes: #8627

Description

We use Stripe URLs to load the card reader manuals. Currently, these links are broken. This PR updates the app to use links that we host these ourselves, so that we can fix issues when required.

The links are:

• M2: https://woocommerce.com/wp-content/uploads/2022/12/m2_product_sheet.pdf
• Chipper: https://woocommerce.com/wp-content/uploads/2022/12/c2xbt_product_sheet.pdf
• WisePad 3: https://woocommerce.com/wp-content/uploads/2022/12/wp3_product_sheet.pdf

Testing instructions

Using a US store

1. Go to the Menu, then Payments
2. Open Card Reader Manuals
3. Open the Chipper manual, and observe that it is the correct manual not a 404
4. Go back, and open the M2 manual. Again observe it's the correct manual and not a 404

Using a CA store

Repeat, but open and check the WisePad 3 manual.

Screenshots

updated-manuals.mp4

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• I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary.

[wpmobilebot]

You can test the changes from this Pull Request by:

• Clicking here or scanning the QR code below to access App Center
• Then installing the build number pr8628-6ca5069 on your iPhone

If you need access to App Center, please ask a maintainer to add you.

[malinajirka]

LGTM, thanks!