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Currently the section toggle buttons just announce the tooltips, which
are a succinct "Show Suggestions" or "Hide Suggestions".

This CL makes the announcement a more explanatory:
"Show the 'Related to recent searches' section"

Bug: 1099788
Change-Id: I7a8e982ab9bf1b62d8e5f5200174ff2ebb19488a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2295929
Commit-Queue: Tommy Li <tommycli@chromium.org>
Reviewed-by: Aaron Leventhal <aleventhal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#788762}