Update README.md

Author: evgeniy-antonyuk

README.md

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 ## Overview
 
-ONLYOFFICE Document Server is an online office suite comprising viewers and editors for texts, spreadsheets and presentations, fully compatible with Office Open XML formats: .docx, .xlsx, .pptx and enabling collaborative editing in real time.
+ONLYOFFICE Document Server is an open-source office suite that comprises all the tools you need to work with documents, spreadsheets, presentations, PDFs, and PDF forms. The suite supports office files of all popular formats (DOCX, ODT, XLSX, ODS, CSV, PPTX, ODP, etc.) and enables collaborative editing in real time.
 
 Starting from version 6.0, Document Server is distributed as ONLYOFFICE Docs. It has [three editions](https://github.com/ONLYOFFICE/DocumentServer#onlyoffice-document-server-editions). With this image, you will install the free Community version.