Suggestion on the document

[신희암]

It would be better if you add descriptions on why such things happen

For mybuild_do_build() in 6.1 Create the mybuild class, why the name of the task is changed.

• When we use addtask, the name of mybuild_do_build is build:
  addtask build
• When we use EXPORT_FUNCTIONS, the name of mybuild_do_build is do_build:
  EXPORT_FUNCTIONS do_build

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[Harald Achitz]

thanks! I added some text that should explain why addtask dies not reuqire the do_ prefix (it is added per default, if it is not given)