Update faq.txt

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@ -275,6 +275,9 @@ Q: Are there any video-tutorials for bdfconv?
A: This is what I found on youtube: https://www.youtube.com/watch?v=Igkb7ZmO31A
The above video uses the -M option (instead of -m) to provide a map file with the unicodes.
Q: Is there any simple way to create a font with some custom chars?
A: This online tool might be useful: http://www.kidsgo.net/u8g2/
Q: How can I use multiple SPI Displays?
A: For each additional display, separate CS (Chip select) is required.
There are two options for the RST (Reset) line: