Fix maxItemText message for maxItemCount === 1

[fareesh]

Description

Minor text change to the maxItemText message for maxItemCount === 1

Screenshots (if appropriate)

Types of changes

• Chore (tooling change or documentation change)
• Refactor (non-breaking change which maintains existing functionality)
• 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 not work as expected)

Checklist

• My code follows the code style of this project.
• I have added new tests for the bug I fixed/the new feature I added.
• I have modified existing tests for the bug I fixed/the new feature I added.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.

[Xon]

The new singleModeForMultiSelect option basically makes this non-required for select-multiple but I guess it could apply for the text backing element.

However, please rebase this as quite a bit has changed