Remove Newlines from nginx Plugin in ReadMe

[andrew-aiken]

What type of PR is this?
/kind cleanup

Any specific area of the project related to this PR?
/area documentation

What this PR does / why we need it:
Cleans up the markdown on the main readme page for the nginx plugin

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[poiana]

Thanks for your pull request. Before we can look at it, you'll need to add a 'DCO signoff' to your commits.

📝 Please follow instructions in the contributing guide to update your commits with the DCO

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The list of commits missing DCO signoff:

• 4922aaa Remove extra newlines from nginx plugin

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[poiana]

Welcome @andrew-aiken! It looks like this is your first PR to falcosecurity/plugins 🎉

[poiana]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: andrew-aiken
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