Add Editable and event handling docs for Slate React

docs/libraries/slate-react/editable.md

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+# Editable component
+
+#### `Editable(props: EditableProps)`
+
+The `Editable` component is the main editing component. Note that it must be inside a `Slate` component.
+
+It takes as its props, any props accepted by a Textarea element plus the following props.
+
+```typescript
+export type EditableProps = {
+  decorate?: (entry: NodeEntry) => Range[]
+  onDOMBeforeInput?: (event: InputEvent) => void
+  placeholder?: string
+  readOnly?: boolean
+  role?: string
+  style?: React.CSSProperties
+  renderElement?: (props: RenderElementProps) => JSX.Element
+  renderLeaf?: (props: RenderLeafProps) => JSX.Element
+  renderPlaceholder?: (props: RenderPlaceholderProps) => JSX.Element
+  scrollSelectionIntoView?: (editor: ReactEditor, domRange: DOMRange) => void
+  as?: React.ElementType
+  disableDefaultStyles?: boolean
+} & React.TextareaHTMLAttributes<HTMLDivElement>
+```