[docs] : Update Pergerine docs related to Items component

[ronak2ram]

Description

Not a bug, but an incorrect piece of info on the devdocs relating to the Items component of the peregrine library. On this page it says "check" as an option for selectionModel props and is used in the example code. However, the Items class's propTypes specify that the selectionModel property is either 'checkbox' or 'radio'. Using 'check' here would cause an error.

Related Issue

Closes: #1007

Motivation and Context

Fixes a bug in documentation.

Verification

Verify that peregrine/List/items.js accepts a selectionModel prop that accepts a value "checkbox" and not "check".

How Has This Been Tested?

Screenshots (if appropriate):

Proposed Labels for Change Type/Package

DOCUMENTATION

pwa-devdocs

Checklist:

• I have read the CONTRIBUTING document.
• I have linked an issue to this PR.
• I have indicated the change type and relevant package(s).
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.
• All CI checks are green (linting, build/deploy, etc).
• At least one core contributor has approved this PR.

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[coveralls]

Coverage remained the same at 76.901% when pulling dbf86db on ronak2ram:update-pergerine into c7a8b32 on magento-research:develop.

[supernova-at]

Thanks!

@jcalcaben this doc isn't part of the auto-generation, is it?