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Improve efficient_fuzzer.md by making the following changes:
1. Get rid of static corpus instructions (just use regular corpus)
2. Add details about authenticating to use ClusterFuzz buckets.
3. Eliminate extra newlines
4. Be consistent about the example fuzzer name
5. Mention dict should be ascii encoded

Improve clusterfuzz.md by linking directly to coverage page and by
linking to most recent stats.

Change-Id: I9990ab8ab4811445214735e65a6e8d2bd2319179
Reviewed-on: https://chromium-review.googlesource.com/c/1323272
Commit-Queue: Jonathan Metzman <metzman@chromium.org>
Reviewed-by: Max Moroz <mmoroz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608455}