Something went wrong. The patch debian/patches/Update-0.2-2-File-Function now contains in the description:
"""
Update Man and Menu Shortcut
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wifi-qr (0.2-2) unstable; urgency=medium
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* Improve Summary. (Closes: #989034)
...
Bug-Debian: https://bugs.debian.org/989034
"""
This has nothing to do with the patch.
Why do you patch upstream's README.md with that patch?
If you want to provide additional info, create debian/README.Debian.
Your binary package description has some language mistakes and redundant info. I suggest:
Description: WiFi password share via QR codes
Shares WiFi SSID and password via a QR code.
Generate a QR code of a WiFi network with its password.
Scan QR codes and easily connect to WiFi Networks.
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For Android, OS version 10 and above is supported.
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For iOS, the Shortcut app supports generating WiFi QR codes.