[cups.bugs] [LOW] STR #3165: serial backend parameters "bits" and "stop" documentation

[jsmeix.suse]

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[STR New]

Additionally constraints like
"we only support space parity with 7 bits per character"
and
"we only support mark parity with 7 bits per character and 1 stop bit"
might also be shown in the "Usage" text.

Link: http://www.cups.org/str.php?L3165
Version: 1.3.9