This update adds a link to the Wikipedia article "Euler angles" to the description of the mathutils.Euler class.

I initially was not sure what a "Euler" represented in Blender API, but found the Wikipedia article helpful. I believe others will find the link helpful too if it appears in the class documentation.

This is similar to the Wikipedia links that appear in the mathutils.Matrix class, e.g: https://docs.blender.org/api/blender_python_api_current/mathutils.html?highlight=euler#mathutils.Matrix.adjugate