Update custom-features.md

Author: KevinVandy

docs/guide/custom-features.md

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 #### Default Options and Initial State
 
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 ##### getDefaultOptions
 
 The `getDefaultOptions` method in a table feature is responsible for setting the default table options for that feature. For example, in the [Column Sizing](https://github.com/TanStack/table/blob/main/packages/table-core/src/features/ColumnSizing.ts) feature, the `getDefaultOptions` method sets the default `columnResizeMode` option with a default value of `"onEnd"`.
 
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 ##### getDefaultColumnDef
 
 The `getDefaultColumnDef` method in a table feature is responsible for setting the default column options for that feature. For example, in the [Sorting](https://github.com/TanStack/table/blob/main/packages/table-core/src/features/RowSorting.ts) feature, the `getDefaultColumnDef` method sets the default `sortUndefined` column option with a default value of `1`.
 
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 ##### getInitialState
 
 The `getInitialState` method in a table feature is responsible for setting the default state for that feature. For example, in the [Pagination](https://github.com/TanStack/table/blob/main/packages/table-core/src/features/RowPagination.ts) feature, the `getInitialState` method sets the default `pageSize` state with a value of `10` and the default `pageIndex` state with a value of `0`.
 
 #### API Creators
 
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 ##### createTable
 
 The `createTable` method in a table feature is responsible for adding methods to the `table` instance. For example, in the [Row Selection](https://github.com/TanStack/table/blob/main/packages/table-core/src/features/RowSelection.ts) feature, the `createTable` method adds many table instance API methods such as `toggleAllRowsSelected`, `getIsAllRowsSelected`, `getIsSomeRowsSelected`, etc. So then, when you call `table.toggleAllRowsSelected()`, you are calling a method that was added to the table instance by the `RowSelection` feature.
 
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 ##### createHeader
 
 The `createHeader` method in a table feature is responsible for adding methods to the `header` instance. For example, in the [Column Sizing](https://github.com/TanStack/table/blob/main/packages/table-core/src/features/ColumnSizing.ts) feature, the `createHeader` method adds many header instance API methods such as `getStart`, and many others. So then, when you call `header.getStart()`, you are calling a method that was added to the header instance by the `ColumnSizing` feature.
 
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 ##### createColumn
 
 The `createColumn` method in a table feature is responsible for adding methods to the `column` instance. For example, in the [Sorting](https://github.com/TanStack/table/blob/main/packages/table-core/src/features/RowSorting.ts) feature, the `createColumn` method adds many column instance API methods such as `getNextSortingOrder`, `toggleSorting`, etc. So then, when you call `column.toggleSorting()`, you are calling a method that was added to the column instance by the `RowSorting` feature.
 
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 ##### createRow
 
 The `createRow` method in a table feature is responsible for adding methods to the `row` instance. For example, in the [Row Selection](https://github.com/TanStack/table/blob/main/packages/table-core/src/features/RowSelection.ts) feature, the `createRow` method adds many row instance API methods such as `toggleSelected`, `getIsSelected`, etc. So then, when you call `row.toggleSelected()`, you are calling a method that was added to the row instance by the `RowSelection` feature.
 
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 ##### createCell
 
 The `createCell` method in a table feature is responsible for adding methods to the `cell` instance. For example, in the [Column Grouping](https://github.com/TanStack/table/blob/main/packages/table-core/src/features/ColumnGrouping.ts) feature, the `createCell` method adds many cell instance API methods such as `getIsGrouped`, `getIsAggregated`, etc. So then, when you call `cell.getIsGrouped()`, you are calling a method that was added to the cell instance by the `ColumnGrouping` feature.