shiny/iconvg: add note to think about Right-To-Left languages.
shiny/iconvg: add note to think about Right-To-Left languages.

Change-Id: I583c0162e24cbd84170b48cb463e70ddfe64823b
Reviewed-on: https://go-review.googlesource.com/31531
Reviewed-by: David Crawshaw <a2f0bf29257797dd66800b4fbb9945c3e216c004@golang.org>

golang/exp,golang/exp,golang/exp