Improve lims()/labs() documentation

[paleolimbot]

There are several opportunities to improve the lims() documentation and the labs() documentation. This is a documentation issue intended for the tidyverse dev day (#3267).

• lims() Could use an example comparing the behaviour of coord_cartesian(xlim = ...) to lims(x = ...) (there is a great visual of this on the ggplot2 cheatsheet).

• The lims() and labs() documentation could use a link to scale_continuous() and/or scale_discrete() (both of these pages should also link to lims()/labs()) when stating that the name argument of the scale is the preferred way to set this value in some cases.

These are only suggestions, feel free to add to/debate!

[lock]

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