Add NLLS BVP docs

[ErikQQY]

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Benchmark Results

	master	dd1ee48...	master/dd1ee48a5a185a...
Simple Pendulum/IIP/BoundaryValueDiffEqMIRK.MIRK2()	6.74 ± 0.19 ms	6.55 ± 0.15 ms	1.03
Simple Pendulum/IIP/BoundaryValueDiffEqMIRK.MIRK3()	2.57 ± 0.12 ms	2.47 ± 0.11 ms	1.04
Simple Pendulum/IIP/BoundaryValueDiffEqMIRK.MIRK4()	0.913 ± 0.055 ms	0.888 ± 0.055 ms	1.03
Simple Pendulum/IIP/BoundaryValueDiffEqMIRK.MIRK5()	2.49 ± 0.41 ms	2.47 ± 0.42 ms	1.01
Simple Pendulum/IIP/BoundaryValueDiffEqMIRK.MIRK6()	1.07 ± 0.098 ms	1.05 ± 0.17 ms	1.01
Simple Pendulum/IIP/MultipleShooting(10, Tsit5; grid_coarsening = false)	1.95 ± 0.59 ms	1.95 ± 0.58 ms	1
Simple Pendulum/IIP/MultipleShooting(10, Tsit5; grid_coarsening = true)	3.55 ± 0.88 ms	3.57 ± 0.9 ms	0.995
Simple Pendulum/IIP/MultipleShooting(100, Tsit5; grid_coarsening = false)	0.0537 ± 0.01 s	0.0539 ± 0.012 s	0.997
Simple Pendulum/IIP/MultipleShooting(100, Tsit5; grid_coarsening = true)	0.0666 ± 0.013 s	0.0653 ± 0.019 s	1.02
Simple Pendulum/IIP/Shooting(Tsit5())	0.25 ± 0.079 ms	0.242 ± 0.073 ms	1.03
Simple Pendulum/OOP/BoundaryValueDiffEqMIRK.MIRK2()	0.0391 ± 0.0011 s	0.0388 ± 0.0011 s	1.01
Simple Pendulum/OOP/BoundaryValueDiffEqMIRK.MIRK3()	11.4 ± 0.43 ms	11.3 ± 0.59 ms	1.01
Simple Pendulum/OOP/BoundaryValueDiffEqMIRK.MIRK4()	3.33 ± 0.22 ms	3.29 ± 0.23 ms	1.01
Simple Pendulum/OOP/BoundaryValueDiffEqMIRK.MIRK5()	9.83 ± 0.88 ms	9.65 ± 0.87 ms	1.02
Simple Pendulum/OOP/BoundaryValueDiffEqMIRK.MIRK6()	3.55 ± 0.27 ms	3.52 ± 0.29 ms	1.01
Simple Pendulum/OOP/MultipleShooting(10, Tsit5; grid_coarsening = false)	3.4 ± 2.6 ms	3.44 ± 2.6 ms	0.988
Simple Pendulum/OOP/MultipleShooting(10, Tsit5; grid_coarsening = true)	6.05 ± 4.4 ms	6.12 ± 4.2 ms	0.99
Simple Pendulum/OOP/MultipleShooting(100, Tsit5; grid_coarsening = false)	0.101 ± 0.005 s	0.101 ± 0.0052 s	1
Simple Pendulum/OOP/MultipleShooting(100, Tsit5; grid_coarsening = true)	0.123 ± 0.0095 s	0.123 ± 0.0064 s	0.996
Simple Pendulum/OOP/Shooting(Tsit5())	0.614 ± 0.043 ms	0.613 ± 0.056 ms	1
time_to_load	5.71 ± 0.16 s	5.52 ± 0.028 s	1.03

Benchmark Plots

A plot of the benchmark results have been uploaded as an artifact to the workflow run for this PR.
Go to "Actions"->"Benchmark a pull request"->[the most recent run]->"Artifacts" (at the bottom).