Update troubleshooting doc

Author: yanhuilifabric

TroubleShooting.md

@@ -3,6 +3,10 @@
 ```DuplicateComponentKeyRegistrationException: org.intellij.plugins.markdown.settings.MarkdownApplicationSettings```
 
 ## Workaround
-Disable `markdown` plugin by adding the following line to file `$HOME\.IdeaIC2019.1\config\disabled_plugins.txt`:
+Disable the `markdown` plugin by adding the following line to file `disabled_plugins.txt`:
 
-```org.intellij.plugins.markdown```
+```org.intellij.plugins.markdown```
+
+### File location
+- Windows: `$HOME\.IdeaIC2019.1\config\disabled_plugins.txt`
+- Mac: `~/Library/Preferences/.IdeaIC2019.1/disabled_plugins.txt`