Missing documentation for Grid frozen column styling

[johannest]

Missing documentation for Grid frozen column styling

https://vaadin.com/docs/latest/components/grid/styling should contain at least frozen column related part names such as frozen-cell, frozen-to-end-cell. See https://github.com/vaadin/web-components/blob/d4202cf98dba2d2142c0f6fd701246e8469d88d3/packages/grid/src/vaadin-grid.js#L200

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