docs: fix inline code style in readme

[hatamiarash7]

Proposed changes

Fix this little problem for an inline code style.

Checklist

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• I have read the CONTRIBUTING guide
• I have proven my fix is effective or that my feature works
• I have checked that all unit tests pass after adding my changes
• I have ensured the README is up to date
• I have rebased my branch onto main
• I will ensure my PR is targeting the main branch and pulling from my branch on my own fork

[nginx-bot]

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[github-actions]

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[hatamiarash7]

I have hereby read the F5 CLA and agree to its terms

[hatamiarash7]

You made the right point. It's fixed.