[Ubuntu Wiki] Update of "X/Troubleshooting" by bryce

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The "X/Troubleshooting" page has been changed by bryce:
http://wiki.ubuntu.com/X/Troubleshooting?action=diff&rev1=56&rev2=57

  === Common Problems ===
  General Issues
   * [[X/Glossary|Glossary]] - Common error messages and terminology
-  * [[X/Troubleshooting/HighCPU|High CPU issues]]
+  * [[X/Troubleshooting/HighCPU|High CPU usage issues]]
+  * [[X/Troubleshooting/HighMemory|High memory usage issues]]
   * [[DebuggingKernelSuspend|Suspend and Resume issues]]
   * [[X/Troubleshooting/XError|Program received an X Window System error]]
   * [[X/Bugs/Transitions|X Transitions]] - Explanation for "installing xserver-xorg-core would break existing software"