Update README.md

Author: NatalyaSenichkina

README.md

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-# Word Processing Document API – How to Generate and Send Business Letters within a Blazor Server App
+# Word Processing Document API – How to Generate and Send Business Letters within a .NET 6 Blazor Server App
 
 This Blazor Server application uses the [Word Processing Document API](https://www.devexpress.com/products/net/office-file-api/word/) to generate multiple business letters based on a template. Users can download these letters in PDF format or send them via e-mail.