[cairo] Matrix Inconsistency?

[Lawrence D'Oliveiro]

I wrote:

> ... the docs for cairo_transform
> <https://www.cairographics.org/manual/cairo-Transformations.html#cairo-transform>
> say “The new transformation of user space takes place after any
                                                        ^^^^^
> existing transformation”.

I think the fix should be to change “after” to “before”.