"up-to-date" should only use hyphens when used as compound modifier of a noun

docs/linux_debugging.md

 # Tips for debugging on Linux
 
 This page is for Chromium-specific debugging tips; learning how to run gdb is
 out of scope.
 
 [TOC]
 
 ## Symbolized stack trace
 
 The sandbox can interfere with the internal symbolizer. Use `--no-sandbox` (but
@@ skipping 390 matching lines @@
 Run with `CHROME_IPC_LOGGING=1` eg.
 
     CHROME_IPC_LOGGING=1 out/Debug/chrome
 
 or within gdb:
 
     set environment CHROME_IPC_LOGGING 1
 
 If some messages show as unknown, check if the list of IPC message headers in
 [chrome/common/logging_chrome.cc](/chrome/common/logging_chrome.cc) is
-up-to-date. In case this file reference goes out of date, try looking for usage
+up to date. In case this file reference goes out of date, try looking for usage
 of macros like `IPC_MESSAGE_LOG_ENABLED` or `IPC_MESSAGE_MACROS_LOG_ENABLED`.
 
 ## Using valgrind
 
 To run valgrind on the browser and renderer processes, with our suppression file
 and flags:
 
     $ cd $CHROMIUM_ROOT/src
     $ tools/valgrind/valgrind.sh out/Debug/chrome
 
@@ skipping 115 matching lines @@
 [Running layout tests on Linux](layout_tests_linux.md) page.
 
 If you need to test something with hardware accelerated compositing
 (e.g., compiz), you can use `Xgl` (`sudo apt-get install xserver-xgl`). E.g.:
 
     Xgl :1 -ac -accel glx:pbuffer -accel xv:pbuffer -screen 1024x768
 
 ## Mozilla Tips
 
 https://developer.mozilla.org/en/Debugging_Mozilla_on_Linux_FAQ