Plot PDF/CDF have misleading x-axis label for offspring distribution

[DxChen0126]

At the current version, no matter what kind of distribution was input, plot PDF/CDF only provide plots with x-axis with label "Time since infection", which is not correct for offspring distribution.

Please include a brief description of the problem with a code example:

# insert reprex here

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[joshwlambert]

Thank you for raising this issue @DxChen0126. I have addressed this in PR #315 and the plotting function should now use the name of the epidemiological distribution and the time units as the x-axis label. For example "Serial Interval (Days)". For the offspring distribution, no units are given so the x-axis just states "Offspring Distribution".

I hope this addresses your issue, if not please feel free to reopen this issue and we can discuss a better solution.