[Threading and Tasks docs] Add link to FAQ from important note in docs

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Change-Id: I5cace503d8a96df09ecfcc76fb4543d5bcc68bf5
Reviewed-on: https://chromium-review.googlesource.com/c/1409459
Reviewed-by: Gabriel Charette <[email protected]>
Commit-Queue: Gabriel Charette <[email protected]>
Cr-Commit-Position: refs/heads/master@{#622642}
diff --git a/docs/threading_and_tasks.md b/docs/threading_and_tasks.md
index fb231fd..fef2a9f 100644
--- a/docs/threading_and_tasks.md
+++ b/docs/threading_and_tasks.md
@@ -310,7 +310,9 @@
 [`base::ThreadChecker`](https://cs.chromium.org/chromium/src/base/threading/thread_checker.h)
 when it’s merely thread-unsafe and should use
 [`base::SequenceChecker`](https://cs.chromium.org/chromium/src/base/sequence_checker.h)),
-please consider fixing it instead of making things worse by also making your API thread-affine.
+please consider
+[`fixing it`](threading_and_tasks_faq.md#How-to-migrate-from-SingleThreadTaskRunner-to-SequencedTaskRunner)
+instead of making things worse by also making your API thread-affine.
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