[docs] Delete duplicate link

Change-Id: I03fcee4fcd8493e895c6ad6990201f01daf45b0e
Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/585801
Fuchsia-Auto-Submit: Shai Barack <shayba@google.com>
Commit-Queue: Auto-Submit <auto-submit@fuchsia-infra.iam.gserviceaccount.com>
Reviewed-by: Jay Zhuang <jayzhuang@google.com>
diff --git a/docs/concepts/testing/coverage.md b/docs/concepts/testing/coverage.md
index 6ef00d1..5640ccb 100644
--- a/docs/concepts/testing/coverage.md
+++ b/docs/concepts/testing/coverage.md
@@ -279,7 +279,6 @@
 *   [Code Coverage Best Practices][gtb-coverage-best]{:.external}
 *   [Measuring Coverage at Google][gtb-coverage-measure]{:.external}
 *   [Understand Your Coverage Data][gtb-coverage-understand]{:.external}
-*   [Measuring Coverage at Google][gtb-coverage-measure]{:.external}
 *   [How Much Testing is Enough?][gtb-testing-enough]{:.external}
 
 [assert-no-deps]: https://gn.googlesource.com/gn/+/HEAD/docs/reference.md#var_assert_no_deps