Fix relative link in security docs.

TBR=rsesek@chromium.org

Bug: none
Change-Id: Iaf00d2457c5cde674e179d96f5d2c8852233a6dc
Reviewed-on: https://chromium-review.googlesource.com/756779
Reviewed-by: Chris Palmer <palmer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#514631}
diff --git a/docs/security/integer-semantics.md b/docs/security/integer-semantics.md
index e6508db..87569cf 100644
--- a/docs/security/integer-semantics.md
+++ b/docs/security/integer-semantics.md
@@ -18,7 +18,7 @@
 practices:
 
 * Use the [integer templates and cast templates in
-base/numerics](../base/numerics/README.md) to avoid overflows, **especially when
+base/numerics](../../base/numerics/README.md) to avoid overflows, **especially when
 calculating the size or offset of memory allocations**.
 * Use unsigned types for values that shouldn't be negative or where defined
 overflow behavior is required.