Typo error in CtkComboBox Methods

[enarddpascua]

A simple typo error in the CtkComboBox .set method.

Issue:

• .set(value) Set combobox to specific string value. Value don't has to be part of the values list.

Recommended fix:

• Value doesn't need to be part of the values list
• Value does not need to be included in the list of values.
• Value doesn't necessarily need to be included in the list of values.