Error in admin documentation and tutorial 2 - 'classes' should be a list
|Reported by:||Owned by:||nobody|
|Has patch:||no||Needs documentation:||no|
|Needs tests:||no||Patch needs improvement:||no|
The documentation claimes:
'classes' A string containing extra CSS classes to apply to the fieldset. Apply multiple classes by separating them with spaces.
This is false. 'classes' is expected to be a list or tuple. The example in admin.txt is correct, the code in tutorial 2 is wrong.