Settings WebUI: Update description for 'Enhanced spell check'

Bug: 960358
Change-Id: I13c9709b101a5247a65a6d801a7b11647ade74bf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1613880
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Commit-Queue: John Lee <johntlee@chromium.org>
Cr-Commit-Position: refs/heads/master@{#660080}
1 file changed