fix(menu): allow menu option group to use array prop

[peoray]

Description

The documentation says CMenuOptionGroup accepts a string, number, Array as a value of the :value attribute. However, when the array is passed, a warning is thrown in the console:

Invalid prop: type check failed for prop "value". Expected String, Number, got Array

However, the component itself works as expected.

This PR fixes the error and allow the value prop to be passed as an array.

Motivation and Context

Fixes #497

How Has This Been Tested?

I tested with Storybook and the error wasn't displayed on the console when the fix was applied

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

[changeset-bot]

🦋 Changeset detected

Latest commit: 5f978f7

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 5 packages

Name	Type
nuxt-js	Minor
@chakra-ui/vue	Minor
@chakra-ui/nuxt	Minor
@chakra-ui/theme-vue	Minor
chakra-ui-docs	Minor

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[codebender828]

👍🏽 Nice work, @peoray