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 
Commit-Queue: Thomas Anderson 
Cr-Commit-Position: refs/heads/master@{#727226}
diff --git a/docs/linux/debugging.md b/docs/linux/debugging.md
index 430778e..329783f 100644
--- a/docs/linux/debugging.md
+++ b/docs/linux/debugging.md
@@ -317,7 +317,7 @@
 
 ## Breakpad minidump files
 
-See [linux_minidump_to_core.md](linux_minidump_to_core.md)
+See [minidump_to_core.md](linux/minidump_to_core.md)
 
 ## Running Tests
 
@@ -444,7 +444,7 @@
 
 See
 https://sites.google.com/a/chromium.org/dev/developers/profiling-chromium-and-webkit
-and [Linux Profiling](linux_profiling.md).
+and [Linux Profiling](profiling.md).
 
 ## i18n
 
@@ -475,7 +475,7 @@
 
 ## Breakpad
 
-See the last section of [Linux Crash Dumping](linux_crash_dumping.md).
+See the last section of [Linux Crash Dumping](crash_dumping.md).
 
 ## Drag and Drop