fix generated links

qualify bookmaker links to remove
file reference if intra-file and
add class reference if part of
a class

TBR=caryclark@google.com
Docs-Preview: https://skia.org/?cl=38722
Bug: skia: 6898
Change-Id: Ie0548485a6e3f596efc0f15b819bd5060e983a5b
Reviewed-on: https://skia-review.googlesource.com/38722
Reviewed-by: Cary Clark <caryclark@skia.org>
Commit-Queue: Cary Clark <caryclark@skia.org>
6 files changed