LocalPickup: fix learn more documentation link

[masteradhoc]

What

Fixes #11231

Why

The "Learn more" option in the Local Pickup tab links currently to the wrong document @pmcpinto reported

Testing Instructions

Please consider any edge cases this change may have, and also other areas of the product this may impact.

1. Go to Settings > Shipping > Local Pickup
2. Click on "Learn more" under Pickup locations
3. Confirm that you're redirected to this page: https://woocommerce.com/document/woocommerce-blocks-local-pickup/

• Do not include in the Testing Notes
• Should be tested by the development team exclusively

Screenshots or screencast

Before	After

WooCommerce Visibility

Required:

• WooCommerce Core
• Feature plugin
• Experimental
• N/A

Checklist

Required:

• This PR has either a [type] label or a [skip-changelog] label.
• This PR is assigned to a milestone.

Conditional:

• This PR has a changelog description (if [skip-changelog] label is not present).
• This PR adds/removes a feature flag & I've updated this doc.
• This PR adds/removes an experimental interfaces, and I've updated this doc.
• This PR has been accessibility tested.
• This PR has had any necessary documentation added/updated.

Changelog

Add suggested changelog entry here.

[opr]

Hey @masteradhoc thanks a lot for taking care of this! CI ran in #11260 and passed, so happy to go ahead and merge!

Just one thing, your testing instructions also include the "reproduction" instructions (checking for the broken link), we don't include those in our release testing instructions, so I'll remove them from the PR instructions too.

I'll update these to only include the "fix" instructions, like so:

Go to Settings > Shipping > Local Pickup
Click on "Learn more" under Pickup locations
Confirm that you're redirected to this page: woocommerce.com/document/woocommerce-blocks-local-pickup