Document breaks/bins/binwidth parameters in stat/geom contour

[sinarueeger]

• Added explicit breaks, nbin and binwidth arguments to stat_contour() and geom_contour(), along with documentation for stat_contour().

• In the parameter description, I added a default value to breaks. Not sure this is ok, as it is the default value to all parameter (when breaks=NULL, nbin=NULL, binwidth=NULL).

Closes #2472.

[sinarueeger]

Questions

• Does this need a news bullet?
• Shall we abandon complete = FALSE as proposed in PR Added documentation for the stat/geom_contour. #2926?
• Out of curiosity, why does geom-contour.r have two @export's?

[paleolimbot]

Thanks for this PR! Yesterday another PR got merged that fixed the unused complete parameter (and implemented some new features), and resolving the merge conflict between that PR and this one was tough! I made sure your documentation for breaks/bins/binwidth made it through the merge resolution, but could you add a NEWS bullet (after doing a Pull from the git tab in RStudio)?

[paleolimbot]

Sorry, I was just reminded that NEWS bullets aren't required for documentation fixes. Thank you for this PR!

[sinarueeger]

Excellent - thanks @paleolimbot for merging + thanks for carrying my changes through the merge conflicts!

[lock]

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