Documentation wxCommand supplementation

[Christoph Borgolte]

      wxCommand::CanUndo

/virtual/* bool* *CanUndo*() /const <- Is missing/

Returns true if the command can be undone, false otherwise.
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/"...canUndo/ tells the command processor whether this command is
undo-able. You can achieve the same functionality by overriding the
CanUndo member function (if for example the criteria for undoability is
context-dependent)..."

Since variable m_canUndo is protected it is sufficient to set m_canUndo
to false in derived classes, but this is a hint to implementation
details of wxCommand. So I'm not sure if this should be mentioned. But
otherwise: if not the variable should be private.

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