docs: Discuss fuzzing in Automated Analysis
docs: Discuss fuzzing in Automated Analysis

Tested by building the docs locally and viewing them in the browser.
The module docs links (module-pw_fuzzer) don't work, but pre-existing
links to module docs also don't work locally, so that doesn't point to
an issue with this change. Filed pwbug/558 to track that.

Change-Id: I5daf5992090c0672b0d03f758a9faf927c9d384b
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/68980
Reviewed-by: Keir Mierle <69344103cc60b36d6e1fbdc31ce6504b2286c646@google.com>
Commit-Queue: Ted Pudlik <c7372cc3e451acc046049fca9e050bcb2a4a3d11@google.com>

google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed