Are `linear_interpolation` and `cubic_spline_interpolation` really correct function names?

[zxm403089989]

I followed exactly the same example in document http://juliamath.github.io/Interpolations.jl/stable/convenience-construction/#Usage. However, Julia said that linear_interpolation and cubic_spline_interpolation are not defined:

using Interpolations

help?> linear_interpolation
search:

Couldn't find linear_interpolation
Perhaps you meant LinearInterpolation or ConstantInterpolation
  No documentation found.

  Binding linear_interpolation does not exist.

help?> cubic_spline_interpolation
search:

Couldn't find cubic_spline_interpolation
Perhaps you meant CubicSplineInterpolation
  No documentation found.

  Binding cubic_spline_interpolation does not exist.

I am wandering that are those information in document true? We can see that function LinearInterpolation and CubicSplineInterpolation are well defined. I suppose these are just typos or there are something need to be updated?