Fix type of td, th props

Closes GH-713.
Closes GH-714.

Reviewed-by: Christian Murphy <christian.murphy.42@gmail.com>
Reviewed-by: Titus Wormer <tituswormer@gmail.com>

Author: lucasassisrosa

lib/ast-to-react.js

@@ -58,15 +58,17 @@
  * @typedef {ComponentPropsWithoutRef<'h1'> & ReactMarkdownProps & {level: number}} HeadingProps
  * @typedef {ComponentPropsWithoutRef<'li'> & ReactMarkdownProps & {checked: boolean|null, index: number, ordered: boolean}} LiProps
  * @typedef {ComponentPropsWithoutRef<'ol'> & ReactMarkdownProps & {depth: number, ordered: true}} OrderedListProps
- * @typedef {ComponentPropsWithoutRef<'table'> & ReactMarkdownProps & {style?: Record<string, unknown>, isHeader: boolean}} TableCellProps
+ * @typedef {ComponentPropsWithoutRef<'td'> & ReactMarkdownProps & {style?: Record<string, unknown>, isHeader: false}} TableDataCellProps
+ * @typedef {ComponentPropsWithoutRef<'th'> & ReactMarkdownProps & {style?: Record<string, unknown>, isHeader: true}} TableHeaderCellProps
  * @typedef {ComponentPropsWithoutRef<'tr'> & ReactMarkdownProps & {isHeader: boolean}} TableRowProps
  * @typedef {ComponentPropsWithoutRef<'ul'> & ReactMarkdownProps & {depth: number, ordered: false}} UnorderedListProps
  *
  * @typedef {ComponentType<CodeProps>} CodeComponent
  * @typedef {ComponentType<HeadingProps>} HeadingComponent
  * @typedef {ComponentType<LiProps>} LiComponent
  * @typedef {ComponentType<OrderedListProps>} OrderedListComponent
- * @typedef {ComponentType<TableCellProps>} TableCellComponent
+ * @typedef {ComponentType<TableDataCellProps>} TableDataCellComponent
+ * @typedef {ComponentType<TableHeaderCellProps>} TableHeaderCellComponent
  * @typedef {ComponentType<TableRowProps>} TableRowComponent
  * @typedef {ComponentType<UnorderedListProps>} UnorderedListComponent
  *
@@ -80,8 +82,8 @@
  * @property {HeadingComponent|ReactMarkdownNames} h6
  * @property {LiComponent|ReactMarkdownNames} li
  * @property {OrderedListComponent|ReactMarkdownNames} ol
- * @property {TableCellComponent|ReactMarkdownNames} td
- * @property {TableCellComponent|ReactMarkdownNames} th
+ * @property {TableDataCellComponent|ReactMarkdownNames} td
+ * @property {TableHeaderCellComponent|ReactMarkdownNames} th
  * @property {TableRowComponent|ReactMarkdownNames} tr
  * @property {UnorderedListComponent|ReactMarkdownNames} ul
  *