module_types.md: clarify code-sample/icon (IJSDK-1003), correct
module_types.md: clarify code-sample/icon (IJSDK-1003), correct

artspb/intellij-sdk-docs,JetBrains/intellij-sdk-docs,artspb/intellij-sdk-docs,JetBrains/intellij-sdk-docs,artspb/intellij-sdk-docs,artspb/intellij-sdk-docs,JetBrains/intellij-sdk-docs