Update README.md

Author: yushulx

examples/official/README.md

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 # Dynamsoft Capture Vision SDK for MRZ Detection
 This repository contains example code for using the Dynamsoft Capture Vision SDK to detect **Machine Readable Zone (MRZ)** in passport, ID card and Visa images.
 
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 ## Prerequisites
 - [Dynamsoft Capture Vision Trial License](https://www.dynamsoft.com/customer/license/trialLicense/?product=dcv&package=cross-platform)
 
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 ## Examples
 - [camera.py](./camera.py): Detect MRZ from a camera video stream.
-- [file.py](./file.py): Detect MRZ from an image file and display the results in a window.
+- [file.py](./file.py): Detect MRZ from an image file and display the results in a window.