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kbdfs(8): document new /dev/kbd behaviour

--- a/sys/man/8/kbdfs

+++ b/sys/man/8/kbdfs

@@ -185,10 +185,10 @@

 file instead. The

 .B c

 message will be resent at the keyboard repeat rate.

-Each

+A single

 .IR read (2)

-will return a single message or block until there are new messages

-available. Opening the

+can return multiple concatenated messages at once (delimited by the null byte)

+or block when there are no messages queued. Opening the

 .BR kbd

 file disables input processing on the

 .BR cons