doc: Avoid mis-interpretation of '+' in device wiring tables
authorKeith Packard <keithp@keithp.com>
Sun, 14 Jun 2020 05:39:35 +0000 (22:39 -0700)
committerKeith Packard <keithp@keithp.com>
Sun, 14 Jun 2020 07:33:34 +0000 (00:33 -0700)
Looks like asciidoctor does something magic with '+' characters in
table contents. Avoid this by using +++. Sigh.

Signed-off-by: Keith Packard <keithp@keithp.com>

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