fix: code examples in Mantine and Chakra UI README.md files

[alicanerdurmaz]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://refine.dev/docs/guides-concepts/contributing/#commit-convention

Bugs / Features

• Related issue(s) linked
• Tests for the changes have been added
• Docs have been added / updated
• Changesets have been added https://refine.dev/docs/guides-concepts/contributing/#creating-a-changeset

Current Behavior

The readme.md files contain incorrect examples.

New Behavior

The examples have been updated.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 1c7de9c

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[cypress]

refine    Run #11653

Run Properties:   Passed #11653  •  df46840a94 ℹ️: Merge 1c7de9cc10c5134470440f21b47828efd384bd6d into 716123cad4c2ef8d2ab1907f8abe...

Project	refine
Branch Review	rk-812-rk-813-fix-mantine-chakra-ui-readme
Run status	Passed #11653
Run duration	16m 52s
Commit	df46840a94 ℹ️: Merge 1c7de9cc10c5134470440f21b47828efd384bd6d into 716123cad4c2ef8d2ab1907f8abe...
Committer	Alican Erdurmaz
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Test results
Failures	0
Flaky	0
Pending	7
Skipped	0
Passing	155
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