Update HowToUseOCR.md

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This document provides instructions on how to add additional language packs for the OCR tab in Stirling-PDF, both inside and outside of Docker.
## My OCR used to work and now doesn't!
Please update your tesseract docker volume path version from 4.00 to 5
The paths have changed for the tessadata locations on new docker images, please use ``/usr/share/tessdata`` (Others should still work for backwards compatability but might not)
## How does the OCR Work
Stirling-PDF uses [OCRmyPDF](https://github.com/ocrmypdf/OCRmyPDF) which in turn uses tesseract for its text recognition.