Updated docstrings for automatic documentation generation

[miguelmaso]

• Added titles for better searching
• Added explicit import Gridap.CellData.update_state!

[github-actions]

Benchmark Results (Julia v1)

Time benchmarks

	main	5cb3141...	main / 5cb3141...
Constitutive models/Visco-elastic Ψ	0.0439 ± 0.019 ms	29.2 ± 19 μs	1.5 ± 1.2
Constitutive models/Visco-elastic ∂Ψ∂F	0.0353 ± 0.018 ms	0.0344 ± 0.019 ms	1.03 ± 0.78
Constitutive models/Visco-elastic ∂∂Ψ∂FF	0.0819 ± 0.036 ms	0.0696 ± 0.038 ms	1.18 ± 0.82
Constitutive models/Visco-polyconvex Ψ	0.18 ± 0.001 μs	0.18 ± 0.001 μs	1 ± 0.0079
Constitutive models/Visco-polyconvex ∂Ψ∂F	0.19 ± 0.001 μs	0.19 ± 0.001 μs	1 ± 0.0074
Constitutive models/Visco-polyconvex ∂∂Ψ∂FF	8.67 ± 5.6 μs	8.58 ± 6.8 μs	1.01 ± 1
Simulations/StaticMechanicalDirichlet	0.143 ± 0.015 s	0.138 ± 0.015 s	1.04 ± 0.15
Simulations/StaticMechanicalNeumann	0.12 ± 0.021 s	0.119 ± 0.02 s	1.01 ± 0.24
Simulations/ViscoElastic	13.5 s	13.1 s	1.04
Tensor algebra/Cofactor	0.08 ± 0.001 μs	0.08 ± 0.01 μs	1 ± 0.13
Tensor algebra/Det(A)Inv(A')	0.11 ± 0.01 μs	0.12 ± 0.02 μs	0.917 ± 0.17
Tensor algebra/IIsym	0.07 ± 0 μs	0.07 ± 0 μs	1 ± 0
Tensor algebra/push_forward_C_to_F	0.24 ± 0.001 μs	0.241 ± 0.23 μs	0.996 ± 0.95
Tensor algebra/×ᵢ⁴	0.07 ± 0 μs	0.07 ± 0 μs	1 ± 0
Tensor algebra/δδ_λ_2d	30 ± 0 ns	30 ± 0 ns	1 ± 0
Tensor algebra/δδ_μ_2d	30 ± 0 ns	30 ± 0 ns	1 ± 0
time_to_load	2.73 ± 0.027 s	2.65 ± 0.01 s	1.03 ± 0.011

Memory benchmarks

	main	5cb3141...	main / 5cb3141...
Constitutive models/Visco-elastic Ψ	0.542 k allocs: 0.0443 MB	0.542 k allocs: 0.0443 MB	1
Constitutive models/Visco-elastic ∂Ψ∂F	0.593 k allocs: 0.0492 MB	0.593 k allocs: 0.0492 MB	1
Constitutive models/Visco-elastic ∂∂Ψ∂FF	1.05 k allocs: 0.0853 MB	1.05 k allocs: 0.0853 MB	1
Constitutive models/Visco-polyconvex Ψ	0 allocs: 0 B	0 allocs: 0 B
Constitutive models/Visco-polyconvex ∂Ψ∂F	0 allocs: 0 B	0 allocs: 0 B
Constitutive models/Visco-polyconvex ∂∂Ψ∂FF	0.187 k allocs: 15.2 kB	0.187 k allocs: 15.2 kB	1
Simulations/StaticMechanicalDirichlet	1.51 M allocs: 0.108 GB	1.51 M allocs: 0.108 GB	1
Simulations/StaticMechanicalNeumann	1.48 M allocs: 0.0927 GB	1.48 M allocs: 0.0927 GB	1
Simulations/ViscoElastic	0.162 G allocs: 12.8 GB	0.162 G allocs: 12.8 GB	1
Tensor algebra/Cofactor	2 allocs: 0.156 kB	2 allocs: 0.156 kB	1
Tensor algebra/Det(A)Inv(A')	4 allocs: 0.25 kB	4 allocs: 0.25 kB	1
Tensor algebra/IIsym	1 allocs: 0.656 kB	1 allocs: 0.656 kB	1
Tensor algebra/push_forward_C_to_F	1 allocs: 0.656 kB	1 allocs: 0.656 kB	1
Tensor algebra/×ᵢ⁴	1 allocs: 0.656 kB	1 allocs: 0.656 kB	1
Tensor algebra/δδ_λ_2d	0 allocs: 0 B	0 allocs: 0 B
Tensor algebra/δδ_μ_2d	0 allocs: 0 B	0 allocs: 0 B
time_to_load	0.149 k allocs: 11.1 kB	0.149 k allocs: 11.1 kB	1