fix bugs exposed by documenting SkImageInfo

- More rigorous symbol identification creates additional
links, and finds spurious errors like unnecessary
parentheses.

- Fixed code to allow preprocessor directives in
#Code blocks (still more to do).

- Fixed examples waiting on fiddle updates.

- Make SkImageInfo officially documented (update in status.json).

- Fixed enum indentation.



Docs-Preview: https://skia.org/?cl=115656
Bug: skia:6898
Change-Id: Ifcf5cfd3f6c03b3b83155c898b2b035a2f3d443c
Reviewed-on: https://skia-review.googlesource.com/115656
Commit-Queue: Cary Clark <caryclark@skia.org>
Reviewed-by: Cary Clark <caryclark@skia.org>
29 files changed