Fix remarks of String.ReplaceLineEndings

[xparadoxical]

Summary

In remarks of both System.String.ReplaceLineEndings methods, every paragraph that isn't the first one is displayed in a code block because of 4 space indentation. This PR removes that identation and also line breaks in paragraphs to let the frontend handle line breaking.

[dnfadmin]

All CLA requirements met.

[opbld31]

Docs Build status updates of commit fa3633f:

✅ Validation status: passed

File	Status	Preview URL	Details
xml/System/String.xml	✅Succeeded	View

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[BillWagner]

Thanks for making that fix @xparadoxical

I've reviewed the changes and I'll now.