Fix GH-12207 memory leak of doc blocks of static properties

When declaring the same static property with a doc block in a class and in a trait,
the doc block of the property in the class

Fix GH-12207 memory leak of doc blocks of static properties

When declaring the same static property with a doc block in a class and in a trait,
the doc block of the property in the class is leaked. While at it, possibly fix doc
comment for internal classes.

Close GH-12238

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