tools: document show-keycodes option for libinput-record

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
44 jobs for master in 3 minutes and 26 seconds (queued for 6 seconds)
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ubuntu:18.10@container-clean

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freebsd:11.2@container-prep

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freebsd:11.2@force-container-prep
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ubuntu:18.04@container-prep

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  Build
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fedora:29@build-no-tests

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fedora:29@scan-build

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fedora:29@valgrind

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freebsd:11.2@default-build

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ubuntu:18.04@default-build

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ubuntu:18.10@default-build

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  Deploy
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wayland-web

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