[SVG] Fix spec links

Lock to SVG 1.1, where they were originally pointing.

Change-Id: I9c770983137375f1daa84a2d0927b5e44f93e7b1
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/282264
Commit-Queue: Florin Malita <fmalita@chromium.org>
Commit-Queue: Tyler Denniston <tdenniston@google.com>
Auto-Submit: Florin Malita <fmalita@chromium.org>
Reviewed-by: Tyler Denniston <tdenniston@google.com>
5 files changed