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1) Clarify that it's not always necessary to reproduce a bug yourself.
2) Move the paragraph about components with their own triage processes
   to the beginning of the triage instruction.
3) Slightly change wording in V8 and Skia guidance. Mention Skia fuzzing
   bugs explicitly.

Change-Id: Ide0bc021675d4f9ea648af3c777470b4cce9975e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2048106
Commit-Queue: Max Moroz <mmoroz@chromium.org>
Reviewed-by: Abhishek Arya <inferno@chromium.org>
Cr-Commit-Position: refs/heads/master@{#740366}