Update markdown files

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TBR=rmistry@google.com
NO_MERGE_BUILDS

No-Try: true
Docs-Preview: https://skia.org/?cl=125642
Change-Id: Iad21d2677892ec4c7f9252b5a3d04532c0f3f2b4
Reviewed-on: https://skia-review.googlesource.com/125642
Commit-Queue: Ravi Mistry <rmistry@google.com>
Reviewed-by: <skia-bookmaker@skia-swarming-bots.iam.gserviceaccount.com>
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