Evaluate the YaRN adjustment at factor forty

Read the equation

Substitution of scale=40 and adjustment strength 1 gives 1+0.1 ln 40=1.3688879454113936. The displayed 1.3688879 is a rounded form of that calculation. This is a deterministic configured coefficient, not a measured model response.

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Original context

THE MAGNITUDE CORRECTION
      yarn_get_mscale(scale, mscale) = 0.1 * mscale * ln(scale) + 1.0   for scale>1
      With scale=40, mscale=1.0:  0.1 * ln(40) + 1.0 = 1.3688879

      cos/sin caches are multiplied by _mscale, computed as
          yarn_get_mscale(factor, mscale) / yarn_get_mscale(factor, mscale_all_dim)
      which equals 1.0 here since mscale == mscale_all_dim == 1.0.

With scale=40, mscale=1.0:  0.1 * ln(40) + 1.0 = 1.3688879

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