Remove internal files from externally visible markdown documentation

Change-Id: I8d2d8d64891b7952bee9f7f39ff15ad30e3fabdd
Reviewed-on: https://skia-review.googlesource.com/93100
Commit-Queue: Florin Malita <fmalita@chromium.org>
Reviewed-by: Florin Malita <fmalita@chromium.org>
1 file changed