plots: smooth: example

[pared]

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Fixes #1439

[shcheklein]

Looks great overall! Let's may be mention in the description (and may be in the -t option) something like e.g. you can use it to make it smooth (see [example](link))

[pared]

@shcheklein I think that adding note to -t would be unfair to our other plots, so I summarized what templates are avialable under plots/plot-templates

[jorgeorpinel]

Copy edits (may need formatting):

[pared]

@jorgeorpinel squashed and reformatted