Adds docstrings for `gr.WaveformOptions`, `gr.Brush`, and `gr.Eraser`, fixes examples for `ImageEditor`, and allows individual images to be used as the initial `value` for `ImageEditor` (#6799)
* tweaks
* add changeset
* adding image editor
* changes
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* docs
* add changeset
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* refactor
* format
* example
* add changeset
* image editor
* add changeset
* commit
* added test
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