Improve markdown table's styling

[budnix]

Context

The PR improves the markdown table styling. The original PR adds a word-break: break-word; style to the table element. That fixed the table responsiveness for the migration guides page but it worsened the table appearance on other sites.

The PR fixes that by applying the above-mentioned style only for migration guides pages.

Before fix:

After fix:

How has this been tested?

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature or improvement (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Additional language file or change to the existing one (translations)

Related issue(s):

1. New docs: [mobile] Tables on the Manual Column move needs some adjustments - first two columns are too narrow #8390

Affected project(s):

• handsontable
• @handsontable/angular
• @handsontable/react
• @handsontable/vue

Checklist:

• I have reviewed the guidelines about Contributing to Handsontable and I confirm that my code follows the code style of this project.
• I have signed the Contributor License Agreement
• My change requires a change to the documentation.

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[Siemienik]

LGTM