man: update descriptions of argument-less kernel cmdline args

This updates the man page for the changes introduced in 1d84ad944520fc3e062ef518c4db4e1d3a1866af.
"=" is kep if the option is predominantly used with an argument, and dropped
otherwise.

v2:
 - update also description of log_color
 - drop '=' in all cases where it is optional
   (previous rule of dropping it only in some cases was just too arbitrary.)

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