documentationgood first issue
Description
The guide attributes, xguide, yguide, and zguide do not show up on the attributes page. Interestingly, the label versions, like xlabel do. This makes it seem like xlabel is the true attribute. However, the label attributes are actually just aliases for the guide attributes. This can lead users to subtle issues, like https://github.com/JuliaPlots/Plots.jl/issues/840 .
The fix is to add a table to the docs which explains the guide attributes, along with naming its aliases.