Fix(core/router/readme) : spelling mistake

[amiresp]

Description

Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context.

Fixes #(issue) spelling mistake

PR Checklist

Please check if your PR fulfills the following requirements:

• Open an issue for bug report or feature request and mention it to this PR.
• The commit message follows our guidelines: https://github.com/AliMD/alwatr/blob/main/CONTRIBUTING.md#commit-message-format
• All methods have proper description in jsdocs format with @example section.
• Docs have been added / updated (for bug fixes / features).
• I have performed a self-review of my own code.

Other information

[alimd]

👍🏻

[github-actions]

Pull Request closed and locked due to lack of activity.
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