Documentation on 'tunable' in Param and LearnerParam is off

[mb706]

?Param and ?LearnerParam both mention

 tunable: [‘logical(1)’]
          Is this parameter tunable? Defining a parameter to be
          not-tunable allows to mark arguments like, e.g., “verbose” or
          other purely technical stuff, and allows them to be excluded
          from later automatic optimization procedures that would try
          to consider all available parameters. Default is ‘TRUE’
          (except for ‘untyped’, ‘function’, ‘character’ and
          ‘characterVector’) which means it is tunable.

The last two lines are misleading for character and characterVector, which do not even have a tunable parameter, and apparently wrong for untyped and funtion, which both have tunable = TRUE in their function head.

> makeUntypedParam
function (id, default, requires = NULL, tunable = TRUE, special.vals = list()) 
[etc]