I noticed that those links' fragments are all "off-by-one". This is due
to https://github.com/KhronosGroup/WebGL/pull/3762, that added a section
at the top of the specification. This patch fixes those links.
Testing: This is a comment-only change, so not covered by any automated
test. I manually navigated to a random subset of those links and checked
they do take to the correct section.
Signed-off-by: Simon Martin <simon@nasilyan.com>