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This CL adds a new test case for a html structure with a link that has
a nested structure. This adds the expected outputs for auralinux and
blink, and updates some README files to be more descriptive and to
update them to be in-line with current test names.

Added a basic nested structure for <a href> links for future test case.

Added test case for the nested structure a link html.

Generated expected results for new nested structure <a href> tests.

Ran code formatter to complete checklist before raising CL.

Updated README to fix typo and incorrect command, added more info.

Updated tests.md readme to fix same typo as in unit_test readme file.

R=dmazzoni

Bug: 1018555
Change-Id: Ibdea155e586d7b4c00fa31b86d6209f1f63b0195
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1951781Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Commit-Queue: Mark Schillaci <mschillaci@google.com>
Cr-Commit-Position: refs/heads/master@{#722543}