Update captions to all plots

[stefsmeets]

Some plots have shaded areas which are not labelled. This can be confusing. We should go through all plots and make sure that any shaded areas are labelled in the legend (whether std or otherwise).

[stefsmeets]

matplotlib captions

• [x] bond_length_distribution
• [x] collective_jumps
• [x] displacement_histogram
• [x] displacement_per_atom
• [x] displacement_per_element
• [x] energy_along_path
• [x] frequency_vs_occurence
• [x] jumps_3d
• [x] jumps_3d_animation
• [x] jumps_vs_distance
• [x] jumps_vs_time
• [x] msd_per_element
• [x] path_on_grid
• [x] radial_distribution
• [x] rectilinear
• [x] shape
• [x] autocorrelation
• [x] vibrational_amplitudes

plotly captions

• [x] collective_jumps
• [x] density
• [x] displacement_histogram
• [x] displacement_per_atom
• [x] displacement_per_element
• [x] frequency_vs_occurence
• [x] jumps_3d
• [x] jumps_vs_distance
• [x] jumps_vs_time
• [x] plot_3d
• [x] msd_per_element
• [x] vibrational_amplitudes

[stefsmeets]

It would be useful if the plots could share code, labels, and docstrings.