Update relative links to Linux docs

This is a followup to [1].

[1] https://chromium-review.googlesource.com/c/chromium/src/+/1974901

TBR=sky

Change-Id: I442ffe121378607bdc5e1b16c081b8d66b138955
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1980900
Reviewed-by: Thomas Anderson <[email protected]>
Commit-Queue: Thomas Anderson <[email protected]>
Cr-Commit-Position: refs/heads/master@{#727226}
diff --git a/docs/ozone_overview.md b/docs/ozone_overview.md
index cb77cef..a47a6dbf 100644
--- a/docs/ozone_overview.md
+++ b/docs/ozone_overview.md
@@ -211,7 +211,7 @@
 * For the GBM platform, you may need to terminate your X server (or any other
   display server) prior to testing.
 * During development, you may need to configure
-  [sandboxing](linux_sandboxing.md) or to disable it.
+  [sandboxing](linux/sandboxing.md) or to disable it.
 
 ## Ozone Platforms