Z3_mk_linear_order docs outdated

[waywardmonkeys]

In 6158ea6, the parameters changed, but the doc comment wasn't updated:

    /**
       \brief declare \c a and \c b are in linear order over a relation indexed by \c id.

       \pre a and b are of same type.


       def_API('Z3_mk_linear_order', FUNC_DECL ,(_in(CONTEXT), _in(SORT), _in(UINT)))
     */
    Z3_func_decl Z3_API Z3_mk_linear_order(Z3_context c, Z3_sort a, unsigned id);