[benqprojector] Update broken link in README (#11383)

* Update broken link in README

Signed-off-by: Michael Lobstein <michael.lobstein@gmail.com>
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This binding is compatible with BenQ projectors that support the control protocol via the built-in ethernet port, serial port or USB to serial adapter.
If your projector does not have built-in networking, you can connect to your projector's serial port via a TCP connection using a serial over IP device or by using`ser2net`.
The control protocol can be found here: https://business-display.benq.com/content/dam/bb/en/product/projector/corporate/lx770/quick-start-guide/lx770-rs232-control-guide-0-windows7-windows8-winxp.pdf
The manufacturer's guide for connecting to the projector and the control protocol can be found in this document: [LX9215_RS232 Control Guide_0_Windows7_Windows8_WinXP.pdf](https://esupportdownload.benq.com/esupport/Projector/Control%20Protocols/LX9215/LX9215_RS232%20Control%20Guide_0_Windows7_Windows8_WinXP.pdf)
## Supported Things