docs: Add chrome_os_logging.md.

Add a document describing where Chrome log messages are
written on Chrome OS.

BUG=none
TEST=none

Change-Id: I2cda9c7397513a75e1c69021ee31c0ad61bc0022
Reviewed-on: https://chromium-review.googlesource.com/837587
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Commit-Queue: Dan Erat <derat@chromium.org>
Cr-Commit-Position: refs/heads/master@{#525510}
diff --git a/docs/README.md b/docs/README.md
index dc5b5826..3f09e6cc 100644
--- a/docs/README.md
+++ b/docs/README.md
@@ -255,6 +255,9 @@
     strings using Chrome for iOS.
 *   [Running iOS test suites locally](ios/testing.md)
 
+### Misc Chrome-OS-Specific Docs
+*   [Chrome Logging on Chrome OS](chrome_os_logging.md)
+
 ### Media
 *   [Audio Focus Handling](media/audio_focus.md) - How multiple MediaSession
     audio streams interact
@@ -310,7 +313,7 @@
     directories are determined on all platforms.
 
 ### Probably Obsolete
-*   [Old ChromeOS build instructions](old_chromeos_build_instructions.md)
+*   [Old Chrome OS build instructions](old_chromeos_build_instructions.md)
 *   [TPM Quick Reference](tpm_quick_ref.md) - Trusted Platform Module notes.
 *   [System Hardening Features](system_hardening_features.md) - A list of
     current and planned Chrome OS security features.