Update general.md

Author: yqz5625

faq/general/general.md

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 5. [How to scan specific pages of a pdf file?](scan-specific-page.html)
 
 6. [How to scan barcodes on US Driver's Licenses and extract the information?](scan-us-drivers-license.html)
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-7. [How does your SDK compare to other commercial SDKs?](competitors-comparison.html)