📚[DOC]: Example for more Geometries, pendulum case.

[mikeatm]

How would you describe the priority of this documentation request

Critical (currently preventing usage)

Is this for new documentation, or an update to existing docs?

New

Describe the incorrect/future/missing documentation

The examples mention and make use of different geometries, including 1-D lines for the mass and spring ODE on a flat surface.
Im unable to see any example for a 2D case of a pendulum, and for my case a double pendulum. How would i setup the geometry
of a double pendulum with lengths L1, L2, and angles theta1 and theta2, in 2D space?
Initial thought was to use a Rectangle in 2D space, with a width and height 2Lx2L, the correctness of this is not obvious to me.

The equations with sympy are convenient however.

If this is a correction, please provide a link to the incorrect documentation. If this is a new documentation request, please link to where you have looked.

https://docs.nvidia.com/deeplearning/modulus/modulus-sym/api/modulus.sym.geometry.html