checkupdates: fix bolding of --nocolor in doc
The --nocolor option in the adoc for checkupdates is missing an asterisk at the start of the line, leading to incorrect display across conversions, as can be seen on archmanweb, among other places.
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The --nocolor option in the adoc for checkupdates is missing an asterisk at the start of the line, leading to incorrect display across conversions, as can be seen on archmanweb, among other places.